25 C.F.R. § 170.933

Can Tribes regulate oversize or overweight vehicles?

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Yes. Tribal governments can regulate travel on roads under their jurisdiction and establish a permitting process to regulate the travel of oversize or overweight vehicles, under applicable Federal law. BIA may, with the consent of the affected Tribe, establish a permitting process to regulate the travel of oversize or overweight vehicles on the BIA road system.