Interstate Highway Speed Limits to Change Next Week

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Traveling through some parts of Idaho is about to get a little faster.

Starting Tuesday, July 1, speed limits on rural stretches of interstates 15, 84 and 86 will increase to 80 mph for passenger automobiles—that's up from the 75 mph speed limit instituted in 1996—and 70 mph for trucks. 

The changes do not affect the 65 mph speed limits between Caldwell and east Boise, nor similar limits in Pocatello and Idaho Falls. 

The speed limit increase was approved by the Idaho Legislature this year and signed into law by Gov. C.L. "Butch" Otter March 18. Part of the law allows for speed limit increases on state highways to 70 mph, though those increases will take effect at a later date pending engineering studies.