Introduction
Just as Utah law requires certain equipment for vehicles, there are also restrictions on items that are unsafe, distracting, or illegal. These rules help keep roads safe and prevent modifications that could endanger drivers, passengers, or other road users.
Prohibited Equipment in Utah
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Red or Blue Flashing Lights
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These are reserved for emergency vehicles only.
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Having them on a personal vehicle can cause confusion and is illegal.
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Siren or Exhaust Whistle
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Only emergency vehicles may use sirens.
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Loud exhaust whistles that mimic emergency sounds are prohibited.
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Illegal Window Tinting
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Front side windows must allow at least 43% of light through.
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Dark tints that reduce visibility for law enforcement and other drivers are not allowed.
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Cut-Out, Bypass, or Defective Muffler
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Vehicles must not have altered or missing mufflers that increase noise levels beyond legal limits.
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Studded Tires (Out of Season)
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Allowed only during winter months (October–March).
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Using them in other seasons damages roads and is unlawful.
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Obstructed Windshield or Windows
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No posters, signs, or objects that block a driver’s view.
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Cracked windshields that obstruct vision are also prohibited.
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Excessive Lighting
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More than four front-facing lights burning at once (including headlights and auxiliary lights) is not allowed.
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Why It Matters
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Prevents accidents caused by confusion or poor visibility.
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Ensures fairness and respect for official emergency vehicles.
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Protects roads, communities, and the environment.
Takeaway
Owning a car doesn’t mean unlimited modifications. Utah law is clear: if equipment reduces safety, mimics emergency vehicles, or distracts others, it doesn’t belong on your car.