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A road sign shows maximum and minimum speed limit for different types of vehicle on expressway in China.Speed limit signs are shown in kilometres per hour.. Speed limits on road traffic, as used in most countries, set the legal maximum speed at which vehicles may travel on a given stretch of road. [1]
An advisory speed limit is a speed recommendation by a governing body, used when it may be non-obvious to the driver that the safe speed is below the legal speed. It is a posting which either approximates the Basic Speed Law or rule (and is subject to enforcement as such) or is based on a maximum g-force exerted at a specific speed.
Highway speed limits can range from an urban low of 25 mph (40 km/h) to a rural high of 85 mph (137 km/h). Speed limits are typically posted in increments of five miles per hour (8 km/h). Some states have lower limits for trucks, some also have night and/or minimum speed limits.
Gatso speed camera. Speed limits are enforced on most public roadways by authorities, with the purpose to improve driver compliance with speed limits.Methods used include roadside speed traps set up and operated by the police and automated roadside "speed camera" systems, which may incorporate the use of an automatic number plate recognition system. [1]
Certain stretches have lower speed limits during wet weather. Some areas have a speed limit of 120 km/h (75 mph) in order to reduce noise pollution during overnight hours (usually 10 pm – 6 am) or because of increased traffic during daytime (6 am – 8 pm). Dynamic traffic signs on an autobahn
Minimum speed limits can also be defined using mandatory road signs, although such signs are rare in most countries; the U.S., which does not use mandatory signs, instead places minimum speed limits on the same type of panel as maximum speed limits.
A more significant factor in developing cruise control was the 35 mph (56 km/h) speed limit imposed in the United States during World War II to reduce gasoline use and tire wear. [5] A mechanism controlled by the driver provided resistance to further pressure on the accelerator pedal when the vehicle reached the desired speed. [5]
The maximum speed limit on rural two-lane roads ranges from 50 mph (80 km/h) in parts of the northeast to 75 mph (120 km/h) in parts of Texas. On rural Interstate Highways and other freeways, the speed limit ranges from 60 mph (96 km/h) in Hawaii to 85 mph (136 km/h) in parts of Texas. All roads in the United States have a speed limit, but it ...