Federal regulations
The Alabama Law Enforcement Agency, Department of Public Safety has adopted
Part 392 of the Federal Regulations. The Public Service Commission has regulations that are similar to the Federal Regulations.
Applicability
Under the Department of Public Safety adoption, Part 392 applies to intrastate commercial motor vehicles 26,001 pounds or more, or vehicles of any size which transport a placardable amount of hazardous materials.
Speed limit
The speed limit is 70 mph on rural interstates, 65 mph on selected 4-lane highways, and the posted speed on urban and 2-lane highways.
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