Enables kinesin binding activity. Involved in positive regulation of axo-dendritic protein transport; positive regulation of establishment or maintenance of cell polarity regulating cell shape; and positive regulation of receptor-mediated endocytosis. Located in axon cytoplasm; axoneme; and neuronal cell body. Colocalizes with ribbon synapse. Orthologous to human KIF3A (kinesin family member 3A). [provided by Alliance of Genome Resources, Apr 2022]