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11th edition of the MUTCD, published December 2023. In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS).
Over 20 states [9] [10] in the United States have enacted "dead red" laws that give motorcyclists and sometimes bicyclists an affirmative defense to proceed through a red light with caution after stopping when they are not detected by the traffic light controller. [11] [12]
One example of a preemptive traffic signal warning sign. In some areas, a "prepare to stop" sign with two alternately flashing yellow lights is installed in locations where a high-speed road (design speed usually at least 55 mph / 90 km/h) leads up to a traffic light, where the traffic light is obscured from a distance (or both conditions), or ...
Traffic must stop before entering the intersection, but may then treat the signal by the same rules as a STOP sign. Red arrow Traffic shall not make the movement displayed by the arrow Traffic must stop before entering the intersection, but may then treat the signal by the same rules as a stop sign to make the movement displayed by the arrow.
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Almost all prohibitory signs use a red circle with a slash. Restrictive signs typically use a red circle, as in Europe. Some may be seated on a rectangular white background. The original MUTCD prohibitory and restrictive signs were text-only (i.e. NO LEFT TURN). [9] Some of these signs continue to be used in the US.
Generally, if a stopped school bus is displaying a flashing, alternating red lamp, a driver of a vehicle meeting or overtaking the stopped bus from either direction (front or back) must stop and wait until the bus moves again or the red light is off. [1]
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