PURPOSE: To make lamps operated by menas of signals from the computor, etc. and facilitate easy maintenance and checking by installing lamp operating devices of each lamp and a signal detector 1 controller for signals coming in from outside in one body with the combination lamp system.

CONSTITUTION: A combination lamp system 6, which includes left and right stop lamps 1a, 1b, back lamps 2a, 2b tail lamps 3a, 3b, parking lamps 4a, 4b and turn-signal lamps 5a, 5b, is composed of operating devices consisting of transistors Q1WQ5 connected in series to each lamp to be operated. Each transistor Q1WQ5 is controlled by means of a signal detector 1 controller system 10 which receives signals from outside through an input terminal 9. In case when start- stop synchronous system serial transmission signals are employed, the signal detector 1 controller system 10 is constituted of a clock oscillator 12, shift registers 12, 15, a parity check circuit 13 and a gate 14.