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In vehicles with separate left and right green turn signal tell-tale on the dashboard, both left and right indicators may flash to provide a visual indication of the hazard flashers' operation. In vehicles with a single green turn signal tell-tale on the dashboard, a separate red tell-tale must be provided for hazard flasher indication.
Headlight flashing might have come into more common use as a means of attempting driver-to-driver communication by the mid-1970s, [3] when cars began to come with headlight beam selectors located on the steering column—typically activated by pulling the turn signal stalk—rather than the previous foot-operated pushbutton switches.
Ambulance in Zlín, Czech Republic, With blue LED lights. Emergency vehicles are permitted to display blue or combination of blue and red emergency lights and an audible warning signal (such as a siren) pursuant to § 41 of Act No. 361/2000, [36] which grants them the ability to ignore certain traffic laws.
Compared with other types of warning devices, the effectiveness of the embedded pavement flashing light system seems to be high. [4] When approaching a crosswalk with an embedded pavement flashing light system, drivers are more apt to slow down and yield to pedestrians than when drivers approach a crosswalk with another type of lighted warning device. [5]
Bulbs used for headlamps, turn signals and brake lamps may be required to comply with international and national regulations governing the types of lamps used. Other automotive lighting applications such as auxiliary lamps or interior lighting may not be regulated, but common types are used by many automotive manufacturers.
In New Zealand, where traffic is on the left, when a road is given a green light from an all-direction stop, a red arrow can continue to display to turning traffic, holding traffic back while a pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).