Understanding California's Windshield Obstruction Laws
Mounting a phone on your windshield in California is a common practice, but its legality hinges on a crucial factor: whether it obstructs the driver's view. California Vehicle Code (CVC) Section 26708 is the primary statute governing obstructions on vehicle windows, including the windshield. This section specifically addresses what can and cannot be placed on the windshield. The core principle is safety; any item that impairs visibility poses a risk to the driver and others on the road. While the law permits certain items, including GPS devices and toll passes, the placement and size are critical. The intent behind CVC 26708 is to ensure that drivers have an unobstructed panoramic view of the highway, traffic, and any potential hazards.
The California Highway Patrol (CHP) and Department of Motor Vehicles (DMV) often provide guidance to clarify these regulations for motorists. Understanding these guidelines is vital for anyone who relies on their smartphone for navigation or hands-free communication while driving in the state. It’s not simply a matter of whether you *can* mount it, but *how* and *where* you mount it that determines compliance with California law. The objective is to prevent drivers from being distracted or having their vision compromised by objects affixed to their windows.
- Mounting phones on CA windshields is legal if view is unobstructed.
- CVC 26708 governs windshield obstructions and driver visibility.
- Placement and size are critical for compliance with the law.
- Safety and unobstructed panoramic view are the main concerns.
The Specifics of Vehicle Code Section 26708
California Vehicle Code Section 26708(a)(1) states that it is a misdemeanor for a person to operate a motor vehicle upon a highway with a windshield, side, or rear window that is in unsafe condition, or is decorated, draped, or covered so as to obstruct the driver’s view. However, there is a crucial exception. CVC Section 26708(b) provides specific allowances for items placed on the windshield. This subsection permits the use of: (A) sun screening devices or other materials that are transparent and do not obstruct the driver's clear view; (B) a notice or decal required by law; (C) a device to collect an electronic toll or pass; and (D) GPS or navigation systems. Crucially, these permitted items must not be on the windshield in a manner that obstructs the driver's clear view through the windshield. The law explicitly mentions that the aggregate area of the permitter devices shall not exceed 7 inches square in the lower right or lower left corner of the windshield, or 5 inches square in the upper right quadrant of the windshield. This language provides a clear framework for what is acceptable.
For devices like phone mounts, the critical interpretation lies in the phrase 'obstructs the driver's clear view'. A large mount, or one placed directly in the driver's line of sight, would undoubtedly violate this provision. The law is designed to prevent drivers from having their attention or vision diverted from the road. Therefore, even if a phone mount itself is not explicitly banned, its installation must adhere to the general principle of not impeding the driver's ability to see their surroundings safely. The intent is to ensure that visibility remains paramount, allowing for a safe driving experience for everyone.
Remember, the primary purpose of this regulation is to ensure unobstructed vision, directly impacting driver safety and the ability to react to road conditions.
Defining 'Obstruction' in the Context of a Phone Mount
What constitutes an 'obstruction' for a phone mount in California is determined by whether it impedes the driver's line of sight or significantly reduces their ability to see the road, traffic, pedestrians, or other hazards. The law doesn't specify exact dimensions for *every* permissible device, but it does give guidelines for the allowed placement areas for certain items, such as navigation devices. A mount that is excessively large, has a bulky arm extending far into the windshield, or is positioned directly in the driver's primary field of vision would likely be considered an obstruction. Conversely, a small, discreet mount placed in a corner of the windshield, outside the main sweep of the driver's vision, is generally acceptable.
The interpretation of 'obstructs the driver's clear view' is often left to the discretion of law enforcement officers at the time of a traffic stop. However, the intent of the law is clear: the windshield must be as clear as possible for the driver. If an officer believes a mounted phone or the mount itself hinders visibility, a citation could be issued. It’s therefore prudent for drivers to err on the side of caution. Opting for mounts that are minimal in size and strategically placed in the lower corners of the windshield, or on the dashboard if feasible and safe, is the most advisable approach to remain compliant and avoid potential legal issues.
The decision to mount a phone on the windshield should always prioritize safety and adherence to legal statutes. The law is not meant to be a burden, but a safeguard. By understanding the nuances of CVC Section 26708, drivers can make informed choices about how they integrate technology into their driving experience without compromising road safety or breaking the law.
Key Considerations for Windshield Phone Mounts in California
When considering whether to mount your phone on a California windshield, several factors must be evaluated to ensure compliance with state law. The most critical aspect is the device's placement and size. California Vehicle Code Section 26708(b)(3) specifically allows GPS or navigation systems (which often includes smartphones used for navigation) provided they meet certain size and placement requirements. These devices, along with other permitted items like toll transponders, cannot exceed specific dimensions and must be located in designated areas of the windshield: typically no larger than a 7-inch square in the lower right or left corner, or a 5-inch square in the upper right quadrant. This rule is paramount because it defines the boundaries of what is considered an acceptable obstruction. Violating these dimensions or placement guidelines can result in a ticket.
Beyond the explicit dimensions, the general principle of not obstructing the driver's clear view remains. This means that even if a mount and phone fit within the allowed corner dimensions, if their combined presence still creates a significant visual impediment, it could be deemed illegal. Imagine a mount that extends significantly upwards from the lower corner, or a phone that is so large it dominates the allowed space and blocks peripheral vision. These scenarios, while perhaps technically within the allowed area, could still lead to a citation. Therefore, drivers should also consider the overall impact on their field of vision. If you find yourself constantly adjusting your head to see around the mounted device, it is likely too obstructive.
Additionally, the type of mount matters. Some mounts attach directly to the glass, while others use suction cups or adhesive pads. The method of attachment itself is not typically the issue; rather, it's the resulting obstruction. However, it's worth noting that any accessory or decoration added to the mount or phone that further impedes vision would also be a violation. The law is comprehensive in its aim to keep the driver's view clear and their attention focused on the road, minimizing distractions from all potential sources.
Placement Rules: Where You Can and Cannot Mount
California law provides specific guidelines for the placement of electronic devices and other accessories on the windshield. According to CVC Section 26708(b)(3), GPS or navigation systems, as well as other permitted items, can be placed in one of two areas: either a 7-inch square in the lower right or lower left corner of the windshield, or a 5-inch square in the upper right quadrant of the windshield. These dimensions are crucial and must be adhered to strictly. The 'lower right' and 'lower left' refer to the corners as viewed from inside the vehicle. The 'upper right quadrant' is also defined from the driver's perspective inside the vehicle.
It is vital to understand that these are the *only* areas where such devices are permitted to be placed without potentially causing an obstruction. Placing a phone mount or the phone itself outside these designated zones—for instance, directly in the center of the windshield, in the driver's direct line of sight, or in the upper left quadrant—is almost certain to be a violation. Law enforcement officers are trained to look for these types of obstructions, and a ticket can be issued if a device is found to be improperly placed. The intent is to ensure that the primary driving view remains completely clear, allowing for maximum awareness of the road ahead and around the vehicle. Always double-check where your mount is situated relative to these allowed zones to maintain compliance.
Prioritize dashboard or vent mounts if your windshield placement options are limited or if you want maximum assurance of compliance.
Impact on Driver Visibility: The Deciding Factor
Ultimately, the legality of a phone mount on a California windshield comes down to its impact on driver visibility. The law, as codified in CVC Section 26708, is designed to prevent any item from obscuring the driver's clear view of the road. This means that even if your mount and phone are placed within the legally specified dimensions (e.g., the 7-inch square in a corner), if their combined presence still creates a significant visual barrier, it can be deemed an illegal obstruction. For example, a mount with an unusually long arm or a phone that is particularly large might still block a portion of the driver's peripheral vision or create glare, even if it technically fits within an allowed zone.
Drivers should perform a self-assessment before mounting their phone. Sit in the driver's seat and look at the windshield. Can you see clearly in all directions? Is the mount or phone creating blind spots? Does it interfere with your ability to see oncoming traffic, pedestrians, cyclists, or road signs? If the answer to any of these questions is yes, then the placement is likely problematic and could lead to a citation. Law enforcement officers will make their own assessment, but the principle remains the same: the windshield must provide an unimpeded view for safe driving. Therefore, choosing a mount that is as compact and unobtrusive as possible, and placing it thoughtfully outside the direct line of sight, is the most prudent course of action.
The most critical factor in determining the legality of a windshield phone mount is whether it impairs the driver's ability to see the road and surrounding environment.
What About Dashboard and Vent Mounts?
While the focus is often on windshield mounts, it's important to consider alternative mounting solutions for your phone in California. Dashboard mounts and air vent mounts are generally considered legal and are often a safer bet for compliance. These mounts do not attach to the windshield, thereby circumventing the specific regulations that govern window obstructions. A dashboard mount, often secured with an adhesive pad or suction cup to the dashboard surface, places the phone in a location that typically does not interfere with the driver's forward visibility. Similarly, air vent mounts clip onto the vehicle's air vents, positioning the phone within reach without compromising the windshield view.
The key advantage of these alternatives is that they do not fall under the purview of CVC Section 26708 regarding windshield obstructions. As long as these mounts do not themselves create a driving hazard—for instance, by being so large or poorly placed that they obstruct other essential controls or mirrors—they are typically permissible. Many drivers find that dashboard or vent mounts offer a secure and convenient way to use their phones for navigation or hands-free calls without the legal concerns associated with windshield mounts. When choosing a mount, consider its overall footprint and how it integrates into your vehicle's interior to ensure it doesn't create any unintended visibility issues or hazards.
Common Misconceptions and What the Law Enforces
One of the most prevalent misconceptions regarding phone mounts in California is that any mount on the windshield is automatically illegal. This is not entirely true. The law, CVC Section 26708, does not outright ban windshield mounts but rather regulates their placement and size to prevent obstruction of the driver's view. Many drivers mistakenly believe that using a phone mounted on the windshield for navigation is the same as using the phone handheld, which is illegal under California's hands-free laws. However, the legality of the mount itself is a separate issue from the legality of interacting with the phone while driving.
The law enforces a clear distinction between items that are permissible accessories and those that create a safety hazard. For example, GPS devices and toll transponders are explicitly allowed under certain conditions because they are considered necessary for navigation or toll collection and their placement is regulated to minimize obstruction. A smartphone, when used for navigation and mounted appropriately, can fall into this category. However, if the mount or phone is placed in a way that impairs visibility, or if the driver is interacting with the phone in a distracting manner (e.g., texting, browsing), then it becomes an issue. The enforcement is about ensuring unobstructed vision and preventing distracted driving, not about banning technology outright.
The Hands-Free Law vs. The Obstruction Law
It is crucial to differentiate between California's hands-free law and its windshield obstruction law. The hands-free law (CVC Section 23124.5) prohibits drivers from using a handheld cell phone while operating a motor vehicle. This means you cannot hold your phone to make calls, text, or use apps. While driving, your phone must be operated using voice commands or other hands-free functions, and even then, you cannot hold it. This law applies regardless of where your phone is mounted or if it's mounted at all. The focus is on how you interact with the device.
The windshield obstruction law (CVC Section 26708) deals with physical objects placed on or attached to the vehicle's windows. As discussed, this law permits certain items, including navigation devices like smartphones, to be placed on the windshield provided they do not obstruct the driver's clear view and are within specified size and location parameters (e.g., 7-inch square in lower corners, or 5-inch square in the upper right). Therefore, you can legally mount your phone for navigation on your windshield in California, but only if it is placed according to CVC 26708 and you only interact with it using hands-free capabilities or by pulling over safely. Combining a violation of the obstruction law with a violation of the hands-free law would result in multiple penalties.
The key is to ensure your phone is mounted legally and used hands-free, never handheld, while driving in California.
What Law Enforcement Looks For
Law enforcement officers in California are trained to enforce traffic safety laws, and this includes identifying potential obstructions on a vehicle's windshield and ensuring drivers are complying with hands-free regulations. When an officer observes a vehicle, they may notice any items attached to the windshield. Their primary concern is whether these items impede the driver's view of the road, traffic, or pedestrians. They will assess the size, placement, and number of items on the windshield. If a phone mount or the phone itself is directly in the driver's line of sight, or if it appears to create a blind spot, an officer may issue a citation under CVC Section 26708.
Furthermore, officers will also be observing the driver's behavior. If a driver is seen physically holding their phone, even if it's mounted, or appears distracted by interacting with the phone while it's in the mount, they may be cited for violating the hands-free law (CVC 23124.5). The officer's assessment of 'obstruction' is subjective, but it is based on whether they believe the visibility necessary for safe driving is compromised. Therefore, drivers should always aim for minimal impact on their view and adhere strictly to the hands-free requirements. Proactive compliance, by choosing discreet mounts and proper placement, is the best way to avoid unwanted attention from law enforcement.
Examples of Permitted and Prohibited Setups
To clarify what is generally considered legal and illegal regarding phone mounts on California windshields, let's look at some examples. A permitted setup would involve a small, unobtrusive phone mount with a smartphone attached, placed in the lower right corner of the windshield, well within the 7-inch square allowance. The phone is used solely for GPS navigation, and the driver interacts with it minimally, using voice commands or by pulling over. This setup respects the dimensions and placement rules and does not significantly block the driver's view.
In contrast, a prohibited setup might include a large, bulky phone mount with a tablet-sized device or multiple items attached in a way that covers a significant portion of the windshield. Another prohibited scenario is a standard phone mount placed in the center of the windshield, directly in the driver's primary line of sight, regardless of its size. Even if placed in a designated corner, if the mount arm extends far into the windshield, or if the phone is used for non-navigation purposes while driving (like watching videos or prolonged texting), it could also be deemed a violation. The overarching principle is always about maintaining clear visibility and hands-free operation. If you have any doubt about whether your setup is compliant, it is safer to choose an alternative mounting location like the dashboard or vent.
Navigating GPS and Navigation Devices
California law specifically addresses the use of GPS and navigation devices, which directly impacts how drivers can use their smartphones for navigation. CVC Section 26708(b)(3) explicitly permits the use of GPS or navigation systems on the windshield, provided they adhere to certain placement and size restrictions. This is a critical allowance, as smartphones have largely replaced dedicated GPS units for many drivers. The law recognizes the utility of these devices for navigation and aims to accommodate them without compromising road safety. The key conditions are that the device must not obstruct the driver's clear view and must be placed within the permitted zones on the windshield.
These permitted zones are defined as a 7-inch square in the lower right or lower left corner of the windshield, or a 5-inch square in the upper right quadrant. This means that your smartphone, when used as a navigation device, can be mounted in these areas. However, the 'obstruction' clause is still paramount. Even within these zones, if the device is excessively large or positioned in a way that still hinders visibility, it could be subject to citation. The law aims for a balance: allowing essential navigational tools while ensuring they don't create new hazards. Drivers must be mindful of this balance, opting for mounts that are as compact as possible and placing their devices thoughtfully.
Allowed Placement for Navigation Devices
To reiterate, California law provides specific safe harbor areas for navigation devices, including smartphones used for GPS. These are: (1) A 7-inch square located in the lower right corner of the windshield. (2) A 7-inch square located in the lower left corner of the windshield. (3) A 5-inch square located in the upper right quadrant of the windshield. These dimensions and locations are designed to keep the devices out of the driver's primary field of vision. The 'quadrant' terminology refers to the area as viewed from the driver's seat. Ensuring your mount and phone are entirely within one of these defined areas is essential for legal compliance when using your phone for navigation.
When placing your device, consider its full dimensions. A mount might fit, but the phone attached to it might extend beyond the allowed area. Always measure or visually confirm that the entire setup remains within the designated 7-inch or 5-inch square. Furthermore, remember that these allowances are for the *device itself* and any associated mounting apparatus. If the mount has an exceptionally long or rigid arm that extends significantly into the windshield space beyond the corner, it could still be considered an obstruction. The spirit of the law is to maintain a clear, unobstructed view, so even within the allowed zones, careful placement matters.
Confirm your phone and mount fit entirely within the 7-inch square in the lower corners or the 5-inch square in the upper right quadrant from the driver's perspective.
Smartphones as Navigation Tools
The evolution of mobile technology means that smartphones are now primary navigation tools for a vast number of drivers. Apps like Google Maps, Waze, and Apple Maps provide real-time traffic updates, route guidance, and points of interest, making them indispensable for many journeys. Recognizing this widespread usage, California law permits the use of these devices as navigation aids, but with the strict conditions already outlined regarding placement and obstruction. The law acknowledges that a smartphone used for GPS is functionally similar to a dedicated GPS unit and should be treated as such under the obstruction statute, provided it is mounted correctly.
This allowance is critical for modern driving. It means you can use your phone for directions without fear of immediate legal repercussion, as long as you are compliant. However, it does not grant permission to engage with the phone in any way other than navigation. Using the phone for calls, texts, or any other app while driving, even if it's mounted, is a violation of California's hands-free law. Therefore, the focus must remain on using the phone solely for its navigational purpose and interacting with it only via voice commands or by pulling over to a safe location. The convenience of smartphone navigation comes with the responsibility of adhering to all traffic laws.
The law permits smartphones for navigation, but only when mounted correctly and used hands-free, never handheld.
What if my Navigation Device is Larger than Allowed?
If your navigation device, such as a large smartphone or a tablet, exceeds the permitted dimensions (7-inch square in corners, 5-inch square in upper right quadrant) or cannot be placed within these zones without obstructing your view, you cannot legally mount it on the windshield. In such cases, you must explore alternative mounting solutions. The most common and compliant alternatives are dashboard mounts or air vent mounts. These options place the device outside the scope of the windshield obstruction laws altogether. A dashboard mount can often accommodate larger devices and can be placed on the dashboard surface, typically keeping it below the line of sight. Air vent mounts are also a viable option, attaching to the air vents and positioning the device within reach without interfering with the windshield.
It is imperative to understand that the law does not provide exceptions for larger devices or different placement locations on the windshield. The specified dimensions and zones are hard limits. Attempting to mount a device that exceeds these parameters on the windshield would constitute a violation of CVC Section 26708. Therefore, if you wish to use a larger screen for navigation, you must do so using a mount that attaches to the dashboard or vent. Always ensure these alternative mounts also do not create any new hazards or obstructions within the vehicle's cabin that could compromise safety. The goal is always to maintain clear visibility and minimize distractions.
Ensuring Safe and Legal Operation
Ensuring the safe and legal operation of your vehicle with a mounted phone in California involves a proactive approach to understanding and adhering to the state's traffic regulations. The primary concern for law enforcement and lawmakers is driver safety, which is directly linked to unobstructed vision and minimal distraction. Therefore, the legality of mounting a phone on your windshield hinges on two main points: first, that the mount and phone do not obstruct your view (CVC Section 26708), and second, that you interact with the phone using hands-free technology only (CVC Section 23124.5). By diligently addressing these two aspects, you can significantly reduce the risk of receiving a citation.
It's not enough to simply place a mount and phone on the windshield and assume compliance. Drivers must actively assess their setup. Does it create blind spots? Does it interfere with your ability to see signs, signals, or other vehicles? Are you tempted to pick up the phone to perform tasks other than navigation? These are questions every driver should ask themselves. Investing in a mount that is designed to be as compact and unobtrusive as possible, and choosing a placement that is well outside your primary field of vision, are excellent first steps. Furthermore, familiarize yourself with the specific requirements of California's hands-free law to ensure you are not interacting with your device in an illegal manner while on the road.
Choosing the Right Mount for Your Vehicle
The selection of a phone mount is a critical decision when aiming for legal and safe operation in California. While windshield mounts are the most controversial due to obstruction laws, other types offer more straightforward compliance. Consider a dashboard mount, which typically adheres to the dashboard surface. These are often adjustable and can position your phone within easy view without encroaching on the windshield. Many use strong adhesive pads or suction cups that are designed for automotive use. Another popular choice is an air vent mount, which clips onto the air conditioning vents. These are generally very compact and keep the phone in a convenient location. However, ensure the vents are sturdy enough to support the weight of your phone and mount, and that it doesn't block essential controls.
When choosing any mount, prioritize size and design. Opt for mounts that are as minimal as possible in terms of bulk and arm length. A mount that holds the phone securely without a lengthy extension is preferable. For windshield mounts, even though other types might be safer bets legally, if you must use one, choose the smallest possible design and place it in the furthest corner away from your direct line of sight. Ultimately, the best mount is one that securely holds your phone, positions it for easy visibility (without obstruction), and allows for hands-free operation, thereby satisfying California's safety and legal requirements.
Look for mounts that offer adjustable viewing angles but also ensure their physical footprint is as small as possible.
Best Practices for Phone Interaction While Driving
California's hands-free law (CVC 23124.5) mandates that drivers use their phones only for hands-free communication or navigation. This means no handheld calls, texting, or app usage while driving. To ensure safe and legal interaction with your mounted phone: 1. Set your destination or playlist before you start driving. 2. Utilize voice commands for making calls or adjusting navigation settings whenever possible. 3. If you must manually adjust settings or input information, pull over to a safe location off the road. 4. Avoid any interaction with the phone if it requires taking your eyes off the road or your hands off the steering wheel for more than a brief, necessary moment for navigation input only.
The key is to minimize distraction. Even brief moments of inattention can have severe consequences. By establishing these best practices, you not only comply with the law but also significantly enhance your safety and the safety of others. Remember that any interaction with your phone that takes your focus away from the driving task, regardless of whether it's handheld or mounted, can be deemed unsafe and potentially lead to a citation or, worse, an accident. Always prioritize your awareness of the road and traffic conditions above all else.
Adhering to hands-free operation is non-negotiable, even when your phone is legally mounted.
What to Do If You Receive a Ticket
If you are cited for a violation related to a phone mount on your windshield in California, it's important to understand the citation. It could be for a windshield obstruction under CVC 26708 or for a hands-free violation under CVC 23124.5, or potentially both. The first step is to carefully review the ticket to understand the specific code section cited. If the ticket is for obstruction, it means the officer believed your mount or phone obstructed your view. If it's for a hands-free violation, it means you were perceived to be using your phone in a handheld manner.
Depending on the specific violation and your driving record, you may have options. Some violations may be eligible for correction, where you can demonstrate to the court or a law enforcement agency that the issue has been resolved (e.g., by removing the mount and providing proof). For others, you may need to pay the fine or contest the ticket in court. If you believe the ticket was issued in error, you have the right to plead not guilty and present your case. This might involve showing photos of your setup, explaining its placement, or arguing that it did not obstruct your view. Consulting with a legal professional specializing in traffic violations can also provide valuable guidance on how to best handle the situation.
Frequently Asked Questions (FAQ)
Here are answers to common questions about mounting phones on windshields in California.
- Windshield phone mounts are legal if they don't obstruct view.
- Placement is key: use allowed corner zones (7-inch square) or upper right (5-inch square).
- Hands-free use is mandatory for phones, regardless of mount.
- Dashboard and vent mounts are generally safer alternatives.
- Always prioritize clear visibility and safe driving practices.
What exactly is the law regarding phone mounts on a California windshield?
California Vehicle Code Section 26708 prohibits obstructions on windshields that impair the driver's clear view. However, it permits navigation devices, including smartphones, to be placed in specific areas: a 7-inch square in the lower corners or a 5-inch square in the upper right quadrant. The critical factor is that the mount and phone must not obstruct your view of the road.
Can I use my phone for GPS navigation while it's mounted on the windshield?
Yes, you can use your phone for GPS navigation if it is mounted in one of the legally permitted areas on the windshield and does not obstruct your view. You must adhere to California's hands-free law, meaning you cannot hold the phone while operating it. Interaction should be via voice commands or by pulling over safely.
Is it legal to mount my phone in the center of my windshield in California?
No, mounting your phone in the center of your windshield in California is generally not legal if it obstructs your view. The law specifies allowed zones for navigation devices: 7-inch squares in the lower corners or a 5-inch square in the upper right quadrant. The center area is typically considered part of the driver's primary field of vision and any obstruction there is prohibited.
Are dashboard or vent phone mounts legal in California?
Yes, dashboard and air vent phone mounts are generally legal in California because they do not attach to the windshield and therefore do not fall under the windshield obstruction laws. As long as these mounts do not create their own obstruction or hazard within the vehicle, they are a compliant alternative for holding your phone.
What are the penalties for illegally mounting a phone on a windshield?
An illegal windshield phone mount can result in a citation under California Vehicle Code Section 26708 for obstruction. This is typically a moving violation and may carry a fine. If the phone is also used in a handheld manner, separate penalties for violating the hands-free law could apply, leading to increased fines and potential points on your driving record.
Does the size of my phone matter for windshield mounting legality?
Yes, the size of your phone and its mount matters. While the law permits navigation devices within specific zones, the overall size and how it fits within those zones are critical. Even if within the permitted corner area, an excessively large phone and mount combination that still obstructs your clear view can be deemed illegal by law enforcement. Opting for smaller, more compact setups is always advisable.
Can I have multiple items on my windshield with a phone mount?
California law permits certain items like GPS devices, toll passes, and inspection stickers, but aggregate area limits apply, usually a 7-inch square in the lower corners or a 5-inch square in the upper right. If adding a phone mount and phone to other items on your windshield exceeds these dimensions or causes an obstruction, it would be illegal. It's best to keep windshield clutter to a minimum.