If a car's turn signal and DRL are separate, though, that doesn't mean it can necessarily keep its DRL on while signaling. It all depends on how close the two light sources are. In the "Spacing To ...

and that resistance is what makes the turn-signal flasher unit turn the lights on and off at a given pace. Change the resistance and it changes the pace. To check which bulb is out, activate the ...

When you come to an intersection with an advanced green light for left turns, are you allowed to turn left when that signal is red as long as the intersection is green? Of course you only proceed ...

Early vehicles used an old-school thermal style flasher to send current to the lights. The way this worked is, a bi-metallic spring would heat up as soon as you activated the turn signal.

On most modern cars, things work a bit differently. Manufacturers now use digital commands to flash the turn signal lights, so there's no actual mechanism to produce the clicking sound.