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Most individual light sources can be rotated and aimed for where light is needed most in an emergency, such as toward fire exits. Modern fixtures usually have a test button of some sort which simulates a power failure and causes the unit to switch on the lights and operate from battery power, even if the main power is still on.
Back-up beepers or an observer are required by OSHA for earth-moving vehicles with an obstructed view to the rear and no one on the ground to help guide the driver. [9] OSHA regulation 29 CFR Part 1926.601(b)(4) requires "a reverse signal alarm audible above surrounding noise level", but only when the motor vehicle has "an obstructed view to the rear".
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The first car registered to drive on the road with full LED rear lights was Land Rover's LCV 2/3 concept car in the 1990s. [144] At the time, the only light function that was difficult to reproduce was the reverse light, as white LEDs did not yet exist.
Backup camera view on the navigation screen of a Lexus IS 250 Backup camera on a Volkswagen Golf Mk7 hidden inside the logo. A backup camera (also called a reversing camera or rear-view camera) is a video camera specifically designed to be attached to the rear of a vehicle to aid in reversing and reduce the rear blind spot.
Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.