A vehicle seat interface assembly having a track including a web having a substantially uniform thickness and one of a key and a key slot. In an optical unit of the present invention, the sealing section includes: a circular seal section surrounding one or a plurality of optical devices on a wiring substrate from an in-plane direction of the wiring substrate; and an inside filling section with which inside of the seal section is filled and that seals the one or plurality of optical devices. A second driver identification procedure is performed on the present operator of the vehicle and determining whether the present operator is an authorized or unauthorized driver of the vehicle, wherein the first and second driver identification procedures are performed with a time interval therebetween, the time interval being dependent upon the nature of the work being performed by the operator. The substrate has a drive circuit part for controlling the motor.