Speed Limits

In Colorado, for roads that are not posted, speed limits are:

  • 20 mph on narrow, winding mountain roads
  • 25 mph in business districts
  • 30 mph in residential districts
  • 40 mph on open mountain highways            

Speed limits should not be set higher or lower than these limits unless a traffic study has been performed to justify the change. The study includes an analysis of roadway conditions, accident records, traffic speed counts. A safe and reasonable limit is established at or below the speed at which 85% of drivers travel.

See Establishing Realistic Speed Limits on the Colorado Department of Transportation website.

Speed Limit Violations

Report neighborhood speeding problems to the Jefferson Sheriff’s Office at 303-980-7300.