Wisconsin Windshield Mounting Laws
Wisconsin law does not include a specific statute that addresses windshield-mounted devices such as GPS units, phone holders, or dashcams by name. Instead, the state regulates windshield obstructions through Wis. Stat. 346.88, which covers obstruction of the operator's view and driving mechanism, and Wisconsin Administrative Code Trans 305.32, which sets equipment standards for window tinting.
This guide explains what you can and cannot mount on your windshield in Wisconsin, the tinting rules, how the state's distracted driving laws affect device use, and the penalties for violations.
Wisconsin Windshield Obstruction Law (Wis. Stat. 346.88)
The primary statute governing windshield-mounted devices is Wis. Stat. 346.88. This statute contains multiple provisions that regulate what can be placed on or near the windshield.
Prohibited Materials on the Windshield
Under subsection (3)(a), no person shall drive any motor vehicle with any sign, poster, or other nontransparent material upon the front windshield, front side wings, side windows in the driver's compartment, or rear window. The only exception is a certificate or other sticker issued by order of a governmental agency, which must not exceed 15 square inches and must be placed in the lower left corner of the windshield.
Objects Obstructing the Driver's View
Under subsection (3)(b), no person shall drive any motor vehicle upon a highway with any object so placed or suspended in or upon the vehicle so as to obstruct the driver's clear view through the front windshield.
This is the provision most relevant to phone mounts, GPS devices, and dashcams. The legal test is whether the object obstructs the driver's clear view. A small device positioned in a corner of the windshield that does not block the driver's line of sight is generally permissible.
Additional Provisions
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Loading and passengers: A vehicle cannot be loaded or contain passengers positioned in a way that obstructs the driver's forward or side vision or interferes with control of the vehicle (subsection 1).
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Passenger positioning: No person shall ride in a position that interferes with the operator's visibility or control (subsection 2).
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Rear window obstructions: If the rear window is obstructed by a load, the vehicle must have an approved outside rearview mirror on each side meeting the requirements of Wis. Stat. 347.40 (subsection 3(c)).
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Emergency vehicle exemption: Signal lamps on authorized emergency vehicles are exempted from these restrictions (subsection 3(d)).
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Clean windshield requirement: Windshields, side wings, and windows must be maintained in a reasonably clean condition at all times (subsection 4).
Penalties for Obstruction Violations
Violating Wis. Stat. 346.88 is a traffic forfeiture. Fines for traffic forfeitures in Wisconsin typically range from $20 to $400, depending on the specific violation and whether it contributed to an accident. Court costs and surcharges are added to the base fine.
If a windshield obstruction contributes to an accident, the driver may face additional civil liability. An obstruction that causes or contributes to a crash strengthens negligence claims in lawsuits and can result in elevated charges.
Wisconsin Windshield Tinting Rules
Wisconsin's window tinting rules are contained in Wisconsin Administrative Code Trans 305.32 and Trans 305.35, which apply to all motor vehicles operated on Wisconsin highways.
Windshield Tint Requirements
| Rule | Requirement |
|---|---|
| Tint strip location | Above the manufacturer's AS-1 line only |
| Tint type | Non-reflective |
| Full windshield tint | Not permitted |
| Vehicles without AS-1 marking | No window tinting film may be attached to the windshield |
Wisconsin is stricter than many states on windshield tinting. If the manufacturer did not affix an AS-1 line marking to the windshield, no aftermarket tinting film may be applied to the windshield at all. This effectively prevents drivers with older or replacement windshields from adding any tint.
Other Window Tint Limits
| Window | Minimum VLT |
|---|---|
| Windshield (above AS-1 line only) | Non-reflective, above AS-1 line |
| Front side windows | 50% |
| Rear side windows | 35% |
| Rear window | 35% |
Wisconsin law also includes a 3% tolerance for law enforcement when measuring total light transmittance. An officer testing your windows with a light meter will allow up to 3% below the stated minimum before issuing a citation.
Reflectivity Rules
Tinting films on all windows must not be reflective. Wisconsin prohibits any metallic or mirrored appearance on vehicle windows. The combination of the glazing and tinting film must permit passage of the minimum VLT percentage while remaining non-reflective.
Side Mirror Requirement
If any rear window does not transmit at least 60% of visible light, the vehicle must be equipped with an outside rearview mirror on both the left and right side of the driver's compartment.
Medical Exemptions
Wisconsin does not have a widely publicized medical exemption process for window tinting. Drivers with medical conditions requiring UV protection should consult the Wisconsin Department of Transportation for current guidance on obtaining a waiver.
Penalties for Tint Violations
Window tint violations in Wisconsin are treated as equipment violations. Fines typically range from $20 to $200 plus court costs and surcharges. Drivers may be required to remove non-compliant tinting material and present the vehicle for reinspection.
GPS and Navigation Device Mounts
Wisconsin permits GPS and navigation devices to be mounted on the windshield. The key legal requirements are:
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The device must not obstruct the driver's view. Position the mount so it does not block your line of sight to the road, traffic signals, or pedestrians.
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The mount cannot be classified as a sign, poster, or nontransparent material. Under Wis. Stat. 346.88(3)(a), these are prohibited on the windshield. A transparent suction cup mount with a small device attached is not considered a "sign" or "poster" under the statute, but the device itself is an "object" governed by subsection (3)(b).
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You should not interact with the device in ways that constitute inattentive driving. Under Wis. Stat. 346.89(1), any activity other than driving that interferes with the ability to drive safely is prohibited.
Best Placement Practices
For legal compliance, mount GPS devices in these locations:
- Lower corner of the windshield (driver or passenger side), below the line of sight to the road ahead
- On the dashboard, using a dashboard mount or friction pad
- Behind the rearview mirror, if the device is small enough not to extend beyond the mirror's profile
Avoid mounting a GPS in the center of the windshield at eye level. While not explicitly banned by statute, this placement creates the strongest argument for an obstruction citation.
Phone Use and Distracted Driving Laws
Wisconsin's distracted driving laws are contained in Wis. Stat. 346.89. Unlike states with comprehensive hands-free laws, Wisconsin does not prohibit all handheld phone use for adult drivers. Instead, the state has targeted restrictions.
What Wis. Stat. 346.89 Prohibits
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Texting while driving (all drivers): No person may drive any motor vehicle while composing or sending an electronic text message or electronic mail message. Using a voice-operated or hands-free feature that does not require the use of hands (except for a single activation touch) is permitted.
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Phone use in construction zones: No person may drive while using a cellular or wireless telephone in a highway maintenance or construction area where workers are at risk from traffic. An exception exists for reporting emergencies and for using voice-operated or hands-free devices.
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All phone use by novice drivers: No person holding a probationary license or instruction permit may drive while using a cellular or wireless telephone, except to report an emergency. This is a complete ban on phone use, including hands-free, for new drivers.
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Inattentive driving (general): No person shall be engaged or occupied with an activity, other than driving the vehicle, that interferes or reasonably appears to interfere with the person's ability to drive safely.
How Phone Mounts Help Wisconsin Drivers
Although Wisconsin does not require hands-free phone use for adult drivers making voice calls, a phone mount is still beneficial:
- It keeps the phone visible for navigation without holding it
- It reduces the temptation to hold the phone, which could trigger an inattentive driving citation
- It positions the phone for voice-activated texting, which is the only legal way to text while driving
- It provides a secure location for the phone in construction zones where hands-free use is required
Penalties for Distracted Driving Violations
| Violation | Fine Range |
|---|---|
| Texting while driving | $20 to $400 |
| Phone use in construction zone | $20 to $400 |
| Novice driver phone use | $20 to $400 |
| Inattentive driving (general) | $20 to $400 |
Fines are doubled if the violation occurs in a construction zone where workers are present. Court costs and surcharges are added to the base fine.
Dashcam Rules in Wisconsin
Wisconsin does not have a statute specifically addressing dashcams or video event recorders. A dashcam is treated the same as any other windshield-mounted object under the general obstruction statute.
Legal Requirements for Dashcams
- The dashcam must not obstruct the driver's clear view through the front windshield (Wis. Stat. 346.88(3)(b))
- The dashcam must not be classified as nontransparent material covering a significant windshield area (Wis. Stat. 346.88(3)(a))
- Interacting with the dashcam while driving must not constitute inattentive driving (Wis. Stat. 346.89)
Recommended Dashcam Placement
The safest legal placement for a dashcam in Wisconsin is behind the rearview mirror, where the camera has a clear view of the road ahead without blocking the driver's line of sight. Small, compact dashcams that fit within the profile of the rearview mirror area are the least likely to draw a citation.
Dashboard-mounted dashcams are also permitted and avoid windshield obstruction concerns entirely.
Audio Recording Considerations
Wisconsin is a one-party consent state for audio recordings. As the vehicle owner and operator, you can legally record conversations inside your own vehicle without notifying passengers. However, it is good practice to inform passengers that a dashcam with audio recording is in use.
Stickers, Decals, and Required Items
Under Wis. Stat. 346.88(3)(a), the only items permitted to be affixed to the windshield are certificates or stickers issued by order of a governmental agency. These must not exceed 15 square inches and must be placed in the lower left corner of the windshield.
Examples of permitted stickers include:
- Vehicle registration stickers (where required)
- Emissions inspection stickers
- Toll transponder tags
- Parking permits issued by government agencies
Non-governmental stickers, decals, and parking passes should not be placed on the windshield. Place them on the dashboard or use a clip on the sun visor instead.
Windshield Damage and Replacement
Wisconsin law requires that windshields be maintained in reasonably clean and unobstructed condition. While the statute does not specify exact crack dimensions, enforcement follows these general principles:
When Windshield Damage May Result in a Citation
- Cracks or chips in the driver's direct line of sight
- Extensive cracking that distorts visibility
- Multiple cracks or chips that collectively impair the view
- Damage combined with dirt or debris that worsens visibility
When Damage Is Typically Allowed
- Small chips outside the driver's line of sight
- Minor cracks that do not extend into the driver's viewing area
- Damage on the passenger side that does not affect the driver's vision
Summary of Wisconsin Windshield Laws
| Topic | Statute | Key Rule |
|---|---|---|
| Windshield obstruction | Wis. Stat. 346.88(3)(b) | No object may obstruct the driver's clear view through the front windshield |
| Nontransparent materials | Wis. Stat. 346.88(3)(a) | No signs, posters, or nontransparent material except government-issued stickers (max 15 sq in, lower left corner) |
| Windshield tint | Trans 305.32 | Above AS-1 line only; no tint if windshield lacks AS-1 marking |
| Front side window tint | Trans 305.35 | Minimum 50% VLT |
| Rear side window tint | Trans 305.35 | Minimum 35% VLT |
| Texting while driving | Wis. Stat. 346.89 | Prohibited for all drivers; voice-operated hands-free permitted |
| Novice driver phone use | Wis. Stat. 346.89 | All phone use prohibited except emergencies |
| Violation penalties | Wis. Stat. 346.88 / 346.89 | $20 to $400, doubled in construction zones |