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  2. Ramp meter - Wikipedia

    en.wikipedia.org/wiki/Ramp_meter

    Metered ramp on I-894 in the Milwaukee area. A Portland, Oregon ramp meter. A ramp meter, ramp signal, or metering light is a device, usually a basic traffic light or a two-section signal light (red and green only, no yellow) together with a signal controller, that regulates the flow of traffic entering freeways according to current traffic conditions.

  3. Road signs in the United States - Wikipedia

    en.wikipedia.org/wiki/Road_signs_in_the_United...

    Bicycle push button for green light. R10-25 ... Ramp meter ahead. W3-8 Ramp metered when flashing. ... Truck escape ramp. W7-4dP Sand. W7-4eP Gravel. W7-4fP Paved.

  4. Ask A Trooper: Ramp meters control entrance ramps

    www.aol.com/ask-trooper-ramp-meters-control...

    Sep. 10—By Sgt. Troy Christianson Question: Hello, we took a trip to the cities this summer. While down there we came across these freeway ramp meters. I know we don't have those in out-state ...

  5. When are freeway on-ramp meters active in California? Can I ...

    www.aol.com/news/freeway-ramp-meters-active...

    If you run a red light at a ramp meter, Leavitt said you could be cited for violating California Vehicle Code 21453, which states a driver must stop when faced with a steady red signal — even if ...

  6. Variations in traffic light operation - Wikipedia

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

    A ramp meter or metering light is a device, usually a basic traffic light or a two-phase (red and green, no yellow) light, that regulates the flow of traffic entering freeways according to current traffic conditions. They are intended to reduce congestion on the freeway in two ways.

  7. Emergency vehicle lighting - Wikipedia

    en.wikipedia.org/wiki/Emergency_vehicle_lighting

    Often used by utility vehicles such as construction vehicles, garbage trucks, semi-trucks amber marker lights and semi-trucks with big and long trailers, snow plows, funeral escorts and hearses, security patrol vehicles, postal vehicles or other vehicles which may be stopped or moving slower than the flow of traffic.

  8. Traffic light - Wikipedia

    en.wikipedia.org/wiki/Traffic_light

    This is an accepted version of this page This is the latest accepted revision, reviewed on 19 February 2025. Signaling device to control competing flows of traffic This article is about lights used for signalling. For other uses, see Traffic light (disambiguation). "Stoplight" redirects here. For other uses, see Stoplight (disambiguation). An LED 50- watt traffic light in Portsmouth, United ...

  9. Runaway truck ramp - Wikipedia

    en.wikipedia.org/wiki/Runaway_truck_ramp

    A runaway truck ramp, runaway truck lane, escape lane, safety ramp, emergency escape ramp, or truck arrester bed is a traffic device that enables vehicles which are having braking problems to stop safely. It is typically a long, sand- or gravel-filled lane connected to a steep downhill grade section of a main road, and is designed to ...

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