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Maximum Posted Speed Limits by Type of Road
(Speed limit in miles per hour)
Interstates are divided into urban and rural sections based primarily on population size and population density. Many roads, particularly urban interstates, often have a lower posted speed limit than the maximum allowable shown in this table.
Insurance Institute for Highway Safety, Highway Loss Data Institute, Maximum posted speed limits, available at www.iihs.org/iihs/topics/t/speed/topicoverview as of June 2015.