Dash cams are valuable tools for documenting drives, accidents, and other incidents. While legal in all states, their usage and placement are subject to varying regulations. Many states, including Alaska, Arizona, and California, require dash cams not to obstruct the driver's view. California has specific mounting zones: a seven-inch square in the lower corner, a five-inch square in the corner nearest the driver, or a five-inch square in the upper-center. Conversely, Illinois mandates placement on the passenger side's bottom corner of the windshield, while Alabama, Delaware, and Louisiana prohibit windshield mounting altogether, requiring dashboard placement. Size restrictions also apply, with most states preferring models under five inches, though Hawaii allows up to seven inches and Indiana limits them to 4 square inches.

Beyond placement and size, recording audio presents further complexities. Thirteen states, including California, Florida, and Pennsylvania, require all parties' consent to record conversations. Other states permit video recording but restrict audio without at least one party's consent. This is particularly relevant for ride-share drivers or those carpooling. To navigate these diverse laws, it's recommended to adhere to the strictest regulations, such as California's, when traveling. Checking individual state Department of Motor Vehicles (DMV) websites before a road trip is crucial. Consider mounting the dash cam behind the rearview mirror or on the dashboard, and be prepared to disable audio recording or inform passengers when entering states with stricter consent laws.