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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.
Virginia state law allows emergency personnel to equip one private vehicle "with no more than two flashing or steady-burning red or red and white combination warning lights". [111] In some states, volunteers are allowed to use the normal red lights, while in other states volunteers must use some other color, usually blue or green.
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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