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A common type of loose wheel nut indicators are small pointed tags, usually made of fluorescent orange or yellow plastic, which are fixed to the lug nuts of the wheels of large vehicles. [2] The tag rotates with the nut, and if the nut becomes loose, the point of the tag shifts noticeably out of alignment with the other tags.
Washington state, particularly Seattle, used a flashing yellow ball in the left-turn signal for the same purpose. Seattle also used a four-lamp signal at about 20 locations, with a red ball, a steady yellow ball, a flashing yellow ball, and a dual-mode yellow and green arrow; during the permissive turn, the flashing yellow ball was displayed. [26]
Amber or yellow flashing lights and lightbars are for warning some special attribute (e.g. oversized, slow, parking at unexpected places etc.) of vehicles like garbage trucks, road cleaning/control/repair, snow plow, car assistance services, construction, transporting dangerous materials etc. Amber/yellow lights do not grant traffic privileges ...
“A motorist facing a yellow light can proceed through the intersection if it is unsafe to stop,” according to Georgia personal injury firm Butler Kahn. That driver also has the right-of-way ...
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A three-colour signal head should have three non-flashing lights which are red, amber, and green, either arranged horizontally (on the side opposite to the direction of traffic) or vertically (with red on top). A two-colour signal head may be used in temporary operation and consists of red and green non-flashing lights.
The yellow trap occurs when the timing of the amber lights (also known as "yellow" lights in the USA) is asymmetric for two-way traffic on a single road: when a vehicle is waiting to turn across oncoming traffic and receives an amber light from the traffic signal, the driver may assume that oncoming traffic also has received an amber light and ...
LED lights are used for flashing beacon lights on vehicles such as maintenance trucks. [139] Previously, traditional light sources required the engine to continue running to ensure that the battery would not become depleted if the lights were to be used for more than a few hours.