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H 664

MOTOR VEHICLES – Amends existing law to provide that speed limits for vehicles with five or more axles operating at a gross weight of more than 26,000 pounds shall be the same as for other vehicles.

68th Legislature, 2nd Regular Session (2026)

Idaho bill equalizes speed limits for heavy trucks (5+ axles, 26,000+ lbs) with other vehicles, removing current lower-speed restrictions.

Reported Signed by Governor on March 23, 2026 Session Law Chapter 108 Effective: 07/01/2026
#highways #lawenforcement #motorvehicles #transportation
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Bill Summary · H 664

Legislative bill overview

H 664 amends Idaho's motor vehicle code to standardize speed limits for heavy trucks (those with five or more axles weighing over 26,000 pounds) to match the speed limits applied to other vehicles. Currently, these heavy vehicles operate under different, typically lower speed restrictions. The bill removes this differential treatment.

Why is this important

Heavy truck speed limits directly affect highway safety, fuel efficiency, and commercial transportation economics. Currently, the lower speed restrictions for heavy vehicles create a two-tiered system on Idaho roads. This change could increase traffic flow consistency but also raises safety considerations given the longer braking distances and handling characteristics of heavily-loaded large trucks.

Potential points of contention

  • Safety concerns: Heavier vehicles require greater stopping distances; equalizing speeds may increase accident severity without corresponding infrastructure improvements
  • Fuel efficiency and emissions: Heavy trucks typically have lower optimal speeds for fuel consumption; forcing higher speeds could increase operational costs and emissions
  • Interstate commerce considerations: Speed differential laws sometimes exist to harmonize with federal regulations and neighboring states' requirements for commercial vehicle operations

Compiled from official sources — confirm details with the bill’s official record.

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