When the nights are drawing in, drivers resort more frequently to their low-beam headlights – in theory at least! In reality, however, this is a time of year in which many drivers neglect to switch from daytime running lights to their actual headlights as early as they should. This is not a problem when the vehicle is equipped with twilight sensors – its headlights come on automatically when visibility is low. For everyone else though, a gentle reminder: as the name implies, daytime running lights are meant to use during daylight hours – and only then!

Daytime running lights are clearly not as bright as low-beam headlights, but they also differ in the way they emit their light. To make the vehicle conspicuous, even in bright sunlight, they radiate light in the same way as high-beam headlights, though with less intensity. The upshot of this is that daytime running lights are easily capable of glaring other road users when used at night or during the twilight hours.

No rear illumination

There are other good reasons for switching on your low-beam headlights. Regrettably, some car manufacturers neglect to switch on the rear lights when the daytime running lights are active. This means the car has no rear illumination when visibility becomes poorer. Even during daylight hours, a lack of rear lighting and the risk of glare mentioned above can lead to problems in tunnels or gloomy underpasses.

Drivers who forget to activate their light control switch in good time may be punished with a fine. But there’s further motivation for driving with your high-beam or low-beam  lights on – a reason that has nothing to do with fines or visibility: it considerably reduces the risk of your headlights fogging up on the inside .

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