<P> Speed limits in the United States are set by each state or territory . Highway speed limits can range from an urban low of 35 mph ( 56 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 and at night , and occasionally there are minimum speed limits . Most speed limits are set by state or local statute , although each state allows various subdivisions ( counties and municipalities ) to set a different , generally lower , limit . </P>
<P> Speed limits in the United States are set by each state or territory . Highway speed limits can range from an urban low of 35 mph ( 56 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 and at night , and occasionally there are minimum speed limits . Most speed limits are set by state or local statute , although each state allows various subdivisions ( counties and municipalities ) to set a different , generally lower , limit . </P>
what 's the highest speed limit in the usa
what 's the highest speed limit in the usa
85 mph ( 137 km / h )
85 mph ( 137 km / h )