30 km/h zones and similar 20 mph zones are speed limits used across areas of urban roads in some jurisdictions. Although these zones do have the nominal speed limit posted, speeds are generally ensured by the use of physical or psychological traffic calming measures.
30 km/h zones and similar 20 mph zones are speed limits used across areas of urban roads in some jurisdictions. Although these zones do have the nominal speed limit posted, speeds are generally ensured by the use of physical or psychological traffic calming measures.
Source: Wikipedia "30 km/h zone" · CC BY-SA 4.0
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