Idaho Code § 49-716: Clinging to or following vehicles.

(1) No person riding upon any bicycle, coaster, roller skates, skateboard, sled or toy vehicle shall attach it or himself to any vehicle upon a highway.

(2) The provisions of this section shall not prohibit the attachment of a bicycle trailer or bicycle semitrailer to a bicycle if that trailer or semitrailer has been designed for that attachment.

(3) No person riding upon any bicycle or human-powered vehicle shall follow a vehicle so closely as to constitute an immediate hazard to the rider.