GTPase. Intraflagellar transport (IFT) cargo that undergoes bidirectional IFT along the ciliary axoneme when in active GTP-bound state in amphid and phasmid ciliated sensory neurons. Targeting and function as IFT cargo may depend on the BBSome, an IFT cargo adapter. Does not undergo IFT when in inactive GDP-bound state. May in turn play a role in cilium structure and/or function in ciliated sensory neurons. In active GTP-bound state, is targeted to the periciliary membrane in a bbs-8-dependent manner. In inactive GDP-bound state, is diffusely localized in the cilium. Expressed in amphid and phasmid ciliated sensory neurons. No visible phenotype, with seemingly normal ciliary structure, and normal transport and function of IFT proteins such as osm-6. Belongs to the small GTPase superfamily. Rab family.