A first-of-its-kind license for marijuana couriers is nearing approval in Colorado.

The state House gave preliminary approval Tuesday to creating a new "marijuana transporter" license under the pot-regulating agency.

Colorado already has 12 marijuana courier companies, which fill out shipping manifests to move pot from growing warehouses to store shelves. The couriers are currently classified as marijuana "vendors," a broad category which includes other ancillary services.

The new license would give those couriers additional powers, such as temporarily storing pot if an unexpected snowstorm closes a highway. Currently the pot couriers must return to the site of origin if they cannot deliver the marijuana within a designated window.

The courier licenses would cost $7,600 for three years. Legislative analysts predict 24 people will apply.