C.R.S. § 39-27-302

The department may enter into a motor fuel tax and fee cooperative agreement with another jurisdiction or jurisdictions that provide for the administration, collection, and enforcement of each jurisdiction’s motor fuel taxes and fees on motor fuel used by motor carriers. The agreement shall not contain any provision that exempts any motor vehicle, owner, or operator from complying with the laws, rules, and regulations pertaining to motor vehicle licensing, size, weight, load, or operation upon the public highways of this state.