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Whatever the posted speed limit is for traffic. There isn't one set speed limit for this.
25 MPH
70
15MPH
The average speed limit in the United States is typically around 55-65 mph on highways and interstates, and 25-35 mph on urban roads. However, speed limits can vary greatly depending on the specific location and road conditions.
60km/hr
50 mph
25mph otherwise noted.
A realistic speed limit depends on the circumstances, the vehicle, the conditions and the ability of the person in charge. A speed limit suitable for race cars would not be suitable for urban areas.
70 MPH
. 119. The maximum speed limit in a business or residential district in Florida, unless otherwise posted, is 30 m.p.h
I think it's 80 mph, but Seguine TX is currently (summer of '12) considering raising the speed limit on a stretch of SR-130 to 85 mph (137 kph).