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Maximum Posted Speed Limits by Type of Road

(Speed limit in miles per hour)

Notes: 

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.

Source: 

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.