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What (who) is ramp$66679$ - definition
![Runaway ramp on [[Interstate 40]] east of [[Asheville, North Carolina]]](https://commons.wikimedia.org/wiki/Special:FilePath/Runaway truck ramp east of Asheville, NC IMG 5217.JPG?width=200 "Runaway ramp on [[Interstate 40]] east of [[Asheville, North Carolina]]")
![An arrester bed on [[Great Eastern Highway]] in [[Western Australia]], located at the bottom of a hill before an intersection](https://commons.wikimedia.org/wiki/Special:FilePath/Great Eastern Highway Truck Arrester Bed.JPG?width=200 "An arrester bed on [[Great Eastern Highway]] in [[Western Australia]], located at the bottom of a hill before an intersection")
![G4511]] in [[Heyuan]], [[China]]](https://commons.wikimedia.org/wiki/Special:FilePath/Escape Ramp In China Expwy G4511-cropped.jpg?width=200 "G4511]] in [[Heyuan]], [[China]]")
![Mechanical-arrestor truck escape ramp (with heated pavement) on [[US 44]] westbound in [[Avon, Connecticut]]](https://commons.wikimedia.org/wiki/Special:FilePath/TER US 44 Westbound Avon, CT, USA.png?width=200 "Mechanical-arrestor truck escape ramp (with heated pavement) on [[US 44]] westbound in [[Avon, Connecticut]]")
2.jpg?width=200 "An emergency escape ramp on Misiryeong Penetrating Road in Gangwon Province, Korea")
![I-176]] runaway truck ramp in Morgantown, PA](https://commons.wikimedia.org/wiki/Special:FilePath/I-176Runway.jpg?width=200 "I-176]] runaway truck ramp in Morgantown, PA")
![A7]] near [[Amskroud]] in [[Morocco]]](https://commons.wikimedia.org/wiki/Special:FilePath/Escape ramp on the A7 near Amskroud, Morocco.jpg?width=200 "A7]] near [[Amskroud]] in [[Morocco]]")
![Tak]], [[Thailand]]](https://commons.wikimedia.org/wiki/Special:FilePath/Thailand's escape ramp.jpg?width=200 "Tak]], [[Thailand]]")
![M-72]] runaway truck ramp in [[Traverse City, Michigan]]](https://commons.wikimedia.org/wiki/Special:FilePath/Traverse City Runaway Truck Ramp.png?width=200 "M-72]] runaway truck ramp in [[Traverse City, Michigan]]")
![Emergency stopping lane in [[Muğla]], [[Turkey]]](https://commons.wikimedia.org/wiki/Special:FilePath/Emergency stopping lane in Muğla, Turkey.jpg?width=200 "Emergency stopping lane in [[Muğla]], [[Turkey]]")
![Runaway truck ramp on [[Interstate 70]] near [[Silverthorne, Colorado]]](https://commons.wikimedia.org/wiki/Special:FilePath/Runaway truck ramp near Silverthorne, Colorado.png?width=200 "Runaway truck ramp on [[Interstate 70]] near [[Silverthorne, Colorado]]")
![Byala]], [[Bulgaria]]](https://commons.wikimedia.org/wiki/Special:FilePath/Emergency exit on the I-5 road between Ruse and Byala.jpg?width=200 "Byala]], [[Bulgaria]]")
Wikipedia
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. Ramp meters are used at freeway on-ramps to manage the rate of automobiles entering the freeway. Ramp metering systems have proved to be successful in decreasing traffic congestion and improving driver safety.
Ramp meters are claimed to reduce congestion (increase speed and volume) on freeways by reducing demand and by breaking up platoons of cars. Two variations of demand reduction are commonly cited; one being access rate, the other diversion. Some ramp meters are designed and programmed to operate only at times of peak travel demand; during off-peak times, such meters are either showing a steady green, flashing yellow (Maryland), or are turned off altogether. This allows traffic to merge onto the freeway without stopping. Other ramp meters are designed to operate continuously, only being turned off for maintenance or repairs.
