Speed Limits

The maximum speed limit in Illinois is 65 mph on rural interstate highways where posted. The maximum speed limit on most other highways is 55 mph. The maximum speed limit for second division vehicles is 55 mph. You may drive at the maximum allowable speed only under safe conditions. For safety purposes, a minimum speed limit may be posted along certain roadways. When minimum limits are not posted, drivers should not drive so much slower than the maximum limit that they interfere with the normal movement of traffic.

Legal Speed Limit
Rural Areas:	55 mph. (unless otherwise posted)
City/Town Areas:	30 mph (unless otherwise posted)
Alleys:	15 mph
School Zones:	20 mph (school days between 7 a.m. and 4 p.m. when children are present and signs are posted)

The setting of speed limits on streets and highways is a technical science backed by many years of research and experience on what works and doesn't work for the safety and benefit of the motorist. We at the Washington State Department of Transportation are often approached by citizens who feel that a change in the posted speed limit is the answer to a safety problem on a specific highway. Safety is the highest concern in any project we undertake, however changing the posted speed limit is not always the answer.

» Traffic Laws

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