What does it mean if the Daytime Running Lights indicator is on?

If the Daytime Running Lights (DRL) indicator is on, it means that the DRL system is activated. The DRL system will turn on the low-beam headlights whenever the ignition is turned on and the engine is running. The DRL system is designed to make the vehicle more visible to other drivers during daylight hours. Some vehicles also have an automatic headlight dimmer feature that will dim the headlights when it detects oncoming traffic.