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Have you ever noticed cars shutting off one of their front lights to activate a blinker? Well, certainly have, so to find out why see awkward one-eyed vehicles signaling turns at seemingly every intersection.
Because DRL is close to the Direction Indicator, or even incorporated, you have to turn off the DRL during indicating. The same idea applies to the rear lights, if indicating the brake lights have to turn off. The reason is a better signal perception recognition.
OK, so this makes sense: The reason why so many cars look like they’ve had their eyes shot out is to prevent their led daytime running lights from hiding the turn signals from view. Led daytime running lights are steady burning lamps that are used to improve the conspicuity of a vehicle from the front sides when the regular headlamps are not required for driving. In other words, these are the lights that are on all the time to help other drivers see you. Though they’re technically not the same as headlamps, in some cars, the led daytime running lights are actually located in the same place. The combined DRLs and low beams that look especially like one-eyed monsters as they signal their turn with what looks like one headlight blown out.
Each DRL optically combined with a turn signal lamp must be automatically deactivated as a DRL when the turn signal lamp or hazard-warning lamp is activated, and automatically reactivated as a DRL when the turn signal lamp or hazard warning lamp is deactivated. So, It’s pretty straightforward for vehicles with combined blinkers and DRLs. If a car’s turn signal and DRL are separate, though, that doesn’t mean it can keep its DRL on while signaling. It all depends on how close the two light sources are.
The luminous intensity of the DRL is not more than 2,600 cd at any location in the beam and the turn signal lamp meets 2.5 times the base front turn signal photometric requirements. In other words, If the turn signal is very bright and the led daytime running lights is fairly dim, then the DRL wont obscure the turn signal and it’s fine if both lights are close to one another and simultaneously on. The DRL is optically combined with a lower beam headlamp and the turn signal lamp meets 2.5 times the base front turn signal photometric requirements. The DRL is deactivated when the turn signal or hazard warning signal lamp is activated. So basically, if your car uses the DRL as its turn signal, the DRL—unsurprisingly— has to shut off when using the blinker. And if your DRL is separate from your turn signal, there’s a spacing requirement with three exceptions, one of which is to cut off the DRL when signaling.