[roelschroeven]

> to turn off the headlight when the corresponding turn signal is activated

Wait what? Why is a headlight influenced by a turn signal??

I realize that American brake lights and turn signals are more intertwined than is reasonable, I've seen the Technology Connections Youtube video. Are you telling me something similar is going on with headlights?

[sangnoir]

> Wait what? Why is a headlight influenced by a turn signal

All cars with "Daylight Running Lights" (housed in the headlight assembly) turn them off for that side when the turn signal is active. I assumed this is to make the turn signal more obvious (as the change in brightness is more prominent).

[lightedman]

In many cars, the daytime running lights are also the headlights. Mine are in a 2013 Subaru Outback. However, they remain separate from my turn signals and do not deactivate when my signal activates.

For more modern vehicles, they have to turn off the LED/Laser-phosphor unit entirely because the lights design is too radiant and glaring for the turn signal to be seen. GMC and Ford big-ass trucks made within the last 5 years are an example.

[selcuka]

> Wait what? Why is a headlight influenced by a turn signal??

Some new cars, mainly luxury ones, dim headlights. It is to avoid blinding other drivers who may be looking at your turn signal.