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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.
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]
There is a default minimum speed limit on Interstate and primary highways of 45 mph (72 km/h), but only when signs are present. The only roadway in North Carolina currently with a minimum speed limit is the I-77 Express Lanes, with a minimum of 45 mph. Generally there is no minimum on interstates to allow for slow moving farm equipment.
The minimum speed is not lower than 50 km/h [31 mph] and the maximum speed is not higher than 130 km/h [81 mph] (except Germany where no speed limit is defined). [ 9 ] Motorways are designed to carry heavy traffic at high speed with the lowest possible number of accidents.
A speed limit is the limit of speed allowed by law for road vehicles, usually the maximum speed allowed. Occasionally, there is a minimum speed limit. [1] Advisory speed limits also exist, which are recommended but not mandatory speeds. Speed limits are commonly set by the legislative bodies of national or local governments.
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. [1] [2]
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.