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In Pennsylvania, the only vehicle that may pass a stopped school bus with the red lights flashing is an emergency vehicle with its flashing lights and siren activated, but only after the emergency vehicle has come to a complete stop and proceeds with due caution for any students embarking or disembarking. [22] [23]
To supplement the additional warning lights and to help prevent drivers from passing a stopped school bus, a stop arm was added to nearly all school buses; connected to the wiring of the warning lights, the deployable stop arm extended during a bus stop with its own set of red flashing lights.
Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Some have special shapes, such as the octagon for the Stop sign and the crossbuck for railroad crossings.
A flashing amber traffic light usually indicates you have a yield or stop sign as a redundant sign, while a turned-off traffic light usually indicates you have the right-of-way. In the UK and parts of North America, drivers simply treat the junction as being uncontrolled when traffic lights fail, giving way as appropriate, unless a police ...
Regulatory road signs are generally circular, and most warning signs take the form of a triangle. Since 2012, however, a more visibly distinctive design (taken from that used for school signs in the US) has been adopted for pedestrian-related signs: these consist of a fluorescent yellow-green pentagon with black border and symbol.
One of the two students leads the crossing with a series of verbal calls. When a gap in the traffic appears the leader calls "signs out" (both signs are extended onto the road). "Check" (Both students check that traffic is stopping/stopped). "Cross now" (students may cross safely) and finally "signs in" (Signs are withdrawn from road).
Red lights supplement stop signs on the side road approaches. All-way red flashing lights can supplement all-way stop control, but all-way yellow signals are prohibited by US regulations. In Canada a flashing yellow light at an intersection that would otherwise have traffic signals indicates that the traffic signals are malfunctioning.
Sign B2a is a red octagon with a white stop legend. The European Annex to the convention also allows the background to be "light yellow". Sign B2b is a red circle with a red inverted triangle with either a white or yellow background, and a black or dark blue stop legend. The Convention allows for the word "STOP" to be in either English or the ...