driving lights

What vehicle? Are you talking fog lights or DRL's (daytime running lights)?

Bad bulb(s), bad fuse, switch turned off? If it's DRL's it could be you have your parking brake just slightly applied, which on some vehicles shuts them off. If it's fog lights then some vehicles won't keep them on if you shut off your motor, and some will but only if they are turned on before you shut the motor off. If your high-beams are on, then most likely neither your fog lights nor DRL's will work at all.

Cheers - Jonathan

oh...i'm sorry...but i was referring to the DRL's on a 1999 kia sportage. normally when i start the iginition they always comes on, but now they only comes on when i turn on the headlights.