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  2. Geometric design of roads - Wikipedia

    en.wikipedia.org/wiki/Geometric_design_of_roads

    This distance must be long enough that the driver can see any obstruction on the road and stop the vehicle within the headlight sight distance. The headlight sight distance (S) is determined by the angle of the headlight and angle of the tangent slope at the end of the curve. By first finding the headlight sight distance (S) and then solving ...

  3. Federal Motor Vehicle Safety Standard 108 - Wikipedia

    en.wikipedia.org/wiki/Federal_Motor_Vehicle...

    Federal Motor Vehicle Safety Standard 108 (FMVSS 108) regulates all automotive lighting, signalling and reflective devices in the United States. Like all other Federal Motor Vehicle Safety Standards, FMVSS 108 is administered by the United States Department of Transportation 's National Highway Traffic Safety Administration .

  4. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).

  5. Stopping sight distance - Wikipedia

    en.wikipedia.org/wiki/Stopping_sight_distance

    Insufficient sight distance can adversely affect the safety or operations of a roadway or intersection. Stopping sight distance is the distance traveled during the two phases of stopping a vehicle: perception-reaction time (PRT), and maneuver time (MT). [3] Perception-reaction time is the time it takes for a road user to realize that a reaction ...

  6. Headlamp - Wikipedia

    en.wikipedia.org/wiki/Headlamp

    There is no statute which governs the use of headlight covers throughout the United States. Most localities and municipalities will have laws which regulate the use of headlight covers and or tint and will specify the percentage of light that must pass through and/or the minimum distance from which a vehicle's headlights must be visible. [170]

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