1 / Un feu (plural des feux) is a fire in French. Les feux de la
Saint-Jean are bonfires.
2 / on the road, 'les feux de circulation' are the traffic
lights;
3 / On your car, les feux are all the kinds of light ('les feux
de croisement' are dipped headlights, 'les feux stop' are
brakelights, etc..)