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Arkansas has adopted Part 392 of the Federal Regulations
Part 392 applies to any self-propelled or towed motor vehicle used on a highway in intrastate and interstate commerce when the vehicle has a gross vehicle weight rating, gross combination weight rating, gross vehicle weight, or gross combination weight of 10,001 pounds or more, or is of any size transporting a placardable amount of hazardous materials.
The maximum speed limit is 75 mph on controlled access highways, 70 mph on controlled access highways for a vehicle or combination of vehicles with a GVWR, GCWR, GVW, or GCW of 26,001 pounds or more, and 65 mph or as posted on other roadways.