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Example variable speed limit sign in the United States, in mph Digital speed limit sign for variable speed limits. In Germany, the first known experiments with variable speed limit signs took place in 1965 on a 30-kilometre (19 mi) stretch of German motorway, the A8 between Munich and the border city of Salzburg, Austria. Mechanically variable ...
When you drive past a California school, you might notice a sign that reads “Speed limit 25 when children are present.” But what exactly does that mean?
Prior to 2009, a speed limit could be defined in kilometers per hour (km/h) as well as miles per hour (mph). The 2003 version of the MUTCD stated that "speed limits shown shall be in multiples of 10 km/h or 5 mph." [118] If a speed limit sign indicated km/h, the number was circumscribed and "km/h" was written below. Prior to 2003, metric speed ...
The MUTCD's W13 series of signs is for warning signs relating to advisory speeds. Speed limits in the United States are always in miles per hour. Metric advisory speed signs in kilometers per hour used to be authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system. [5]
A U.S. advisory speed limit sign, warning drivers of a curve ahead. 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.
School zones may also sometimes be in effect during school holidays, due to holiday programs that use school premises. In some locations, however, school zone signs will be locked up during school holidays so that motorists can drive to the normal speed limit. School zones typically have speed limits between 15 and 25 mph (25 and 40 km/h).
Actual speed limits may range beyond these values. The enforcement tolerance is specified in km/h or percentage above the stated limit. Germany is the only country where some motorways do not have a maximum speed limit. The 130 km/h is sign-posted as a general advisory speed limit for motorways in the entry of the country.
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related to: speed limit 25 sign meaning