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2. Yellow trap - Wikipedia

   en.wikipedia.org/wiki/Yellow_trap

   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 ...

3. Variations in traffic light operation - Wikipedia

   en.wikipedia.org/wiki/Variations_in_traffic...

   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]

4. Automotive lighting - Wikipedia

   en.wikipedia.org/wiki/Automotive_lighting

   The emergency stop signal is automatically activated if the vehicle speed is greater than 50 km/h (31 mph) and the emergency braking logic defined by regulation No. 13 (heavy vehicles), 13H (light vehicles), or 78 (motorcycles) is activated; the ESS may be displayed when a light vehicle's deceleration is greater than 6 m/s 2 (20 ft/s 2) or a ...

5. Emergency vehicle lighting - Wikipedia

   en.wikipedia.org/wiki/Emergency_vehicle_lighting

   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 ...

6. Rules for traffic lights - Wikipedia

   en.wikipedia.org/wiki/Rules_for_traffic_lights

   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 ...

7. Trafficators - Wikipedia

   en.wikipedia.org/wiki/Trafficators

   The shape differs in that the trafficator has only the lower 'blade' of the rail signal's terminal 'arrowhead', so that the retracted trafficator sits flush with the vehicle's exterior. They were common on vehicles until the introduction of the flashing amber, red or white indicators at or near the corners of the vehicle (and often along the ...