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The Federal Motor Carrier Safety Regulations (Title 49, Parts 350-399) govern all vehicles engaged in interstate traffic. 

There are some situations where a tractor-trailer or other commercial motor vehicle is involved in only intrastate travel. For example, an appliance store in Moscow may own a truck that only makes in-state deliveries. 

The Idaho Department of Public Safety has adopted Title 49, Parts 382-384 and 390-399 of the federal regulations. 

The following provisions are an overview of Idaho laws that affect trucks 
operating only in Idaho:

Driver Qualification

Idaho has adopted Part 391 of the Federal Regulations with some exceptions. The minimum age for intrastate commercial vehicle drivers is 18; interstate drivers must be 21 years old.

Driving of Motor Vehicles

Idaho has adopted the entirety of Part 392 of the Federal Regulations. The speed limit is 75mph on designated interstates, 65 mph on designated interstates for vehicles with five or more axles operating at a gross weight of more than 26,000 pounds, and 65mph or less on state highways.

Crash reports are available from:

Idaho Transportation Department 
Office of Highway Safety 
P.O. Box 7129 
Boise, ID 83707 
(208) 334 8699