In Oklahoma, the maximum posted speed limit is 75 mph (121 km/h) on turnpikes and 70 mph (113 km/h) on all other freeways. Most other rural highways have a 65 mph (105 km/h) speed limit, although some rural divided highways have a 70 mph (113 km/h) limit. Minimum speed limits are 25 mph (40 km/h) below the maximum speed limit on more or less all Interstate Highways. For example, on the turnpikes, which have a maximum speed limit of 75 mph (121 km/h), maximum speed-limit signs are nearly always accompanied by a sign stating a minimum speed limit of 50 mph (80 km/h). Where turnpikes are signed with a speed limit of 75 mph (121 km/h), a sign warning “no tolerance” is posted.
From November 2016 numerical caps will be removed on rural highway speed limits in Oklahoma but the speed limits across the state are not expected to change because of budget issues in doing studies.