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However, these lights sometimes do not detect smaller vehicles such as bikes or motorcycles. Traffic lights that do not service traffic due to non-detection may not meet the federal legal definition adopted by most states for a traffic control signal, which is any device "by which traffic is alternately directed to stop and permitted to proceed".
In some jurisdictions (such as New York City), [citation needed] there are ordinances or by-laws against "gridlocking".A motorist entering an intersection (even if on a green light) but unable to proceed and who gets stranded in the intersection (when traffic ahead fails to proceed), and who remains after the light turns red (thus blocking traffic from other directions) may be cited.
A daytime running lamp (DRL, also daytime running light) is an automotive lighting and bicycle lighting device on the front of a road going motor vehicle or bicycle. [1] It is automatically switched on when the vehicle's handbrake has been pulled down, when the vehicle is in gear , or when the engine is started, emitting white, yellow , or ...
When a traffic light is malfunctioning, state laws differ on whether drivers are allowed to proceed through a red light.
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ISO symbol for long-range lights [8] Auxiliary high beam lights may be fitted to provide high-intensity light to enable the driver to see at longer range than the vehicle's high beam headlights. [13] Such lights are most notably fitted on rally cars, and are occasionally fitted to production vehicles derived from or imitating such
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Blue lights are only permitted to be displayed to the rear or for use by volunteer firefighters or federal law enforcement. In Texas and Washington state, [96] red lights are used on tow trucks, but only if the vehicle is not in motion. Most tow trucks mount rear-facing red lights to be used in sync with the vehicle's normal stop lights.