VEHICLE LAMP SYSTEM

A computer includes a processor and a memory, and the memory stores instructions executable by the processor to receive an input from an operator of a vehicle, the input setting a parameter for a shifting lighting pattern of a lamp of the vehicle, the shifting lighting pattern including cycling through a plurality of colors including a first color; in response to a speed at which the vehicle is traveling exceeding a speed threshold and the vehicle being in an autonomous mode, actuate the lamp to continuously emit the first color; and in response to the speed at which the vehicle is traveling being below the threshold speed, actuate the lamp to emit light following the shifting lighting pattern according to the inputted parameter.