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Rural Interstate Speed-Limit Increase Begins Thursday

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By Paul Johnson

Boise, Idaho ( KMVT-TV / KSVT-TV ) – The speed limits on rural stretches of interstate in southern and eastern Idaho will be raised to 80 mph on Thursday July 24.

The speed limit will increase to 80 mph for vehicle traffic and 70 mph for trucks on rural sections of interstates 15, 84 and 86. The speed limit in the urban areas of the Treasure Valley, between Caldwell and east Boise, as well as through Pocatello and Idaho Falls, will remain at 65 mph.

The Idaho Transportation Board concurred with staff recommendations for raising the speed limit during its July 11 meeting with a requirement of an annual review by the Board to ensure continued safe highway operations.

State forces expect to post the speed changes in a single day but some areas could be delayed depending on the pace of work or other impacts such as high winds.

Drivers are reminded that the speed limit does not take effect until the signs are posted on each section of roadway. The 75 mph speed limit remains enforceable until posting of the 80 mph speed limit signs.

There are no changes to the speed limit on Interstate 90 through northern Idaho at this time.

ITD completed the necessary traffic studies and engineering reviews throughout May and June.

This is the first statewide increase to the interstate speed limit since the increase from 65 mph for vehicles in 1996. The speed limit was raised from 55 mph to 65 mph for all traffic in the 1980’s.


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