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The disc is attached to an axle which also carries a small permanent magnet. Positioned close to the magnet is a solenoid. By pulsing the solenoid coil with the appropriate electrical polarity, the permanent magnet on the axle will align itself with the magnetic field, also turning the disc. Another style uses a magnet embedded in the disc ...
Earlier flat-painted signs gave way to signs with embossed letters, which in turn gave way to button copy signs— round retroreflective "buttons" helped to achieve greater night visibility. Flat metal signs reappeared in the 1980s with the widespread use of surfaces covered with retroflective sheeting materials like Scotchlite.
Some signs can be localized, such as No Parking, and some are found only in state and local jurisdictions, as they are based on state or local laws, such as New York City's "Don't Block the Box" signs. These signs are in the R series of signs in the MUTCD and typically in the R series in most state supplements or state MUTCDs.
Traffic-sign (speed limit) recognition. Traffic-sign recognition (TSR) is a technology by which a vehicle is able to recognize the traffic signs put on the road e.g. "speed limit" or "children" or "turn ahead". This is part of the features collectively called ADAS. The technology is being developed by a variety of automotive suppliers to ...
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These signs are generally rectangular in shape and use white, black and red/or as their primary colors. Warning signs are traffic signs that are used to warn road users about a potential danger. These signs are usually diamond in shape and, except for temporary traffic control signs, have black legends and borders on a yellow background.
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