Lighting and Optical Signals
Study all Lighting and Optical Signals questions for the Spanish DGT theory test.
Reviewed on 7 Oct 2026
35 questions
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- What are the three main functions of a vehicle's lighting system?
- When lighting is mandatory and the vehicle is moving, which lights must be switched on as a minimum?
- During which period of the day is the use of lighting mandatory?
- When is lighting considered insufficient for driving?
- Is it mandatory to switch on the lighting when passing through a tunnel?
- Motorcycles must travel with their lighting switched on:
- Should lighting be used when driving on a reversible lane or a lane in the opposite of its usual direction?
- What do a vehicle's position lights indicate?
- What colour are the position lights at the rear of the vehicle?
- How many front and rear position lights must vehicles other than motorcycles carry as a minimum?
- What is the purpose of parking lights?
- What feature distinguishes reflectors (catadioptrics) from position lights?
- When is the dipped beam (low beam) used?
- Where is the use of main beam (high beam) permitted?
- You are driving at night on an unlit road with main beam on and a vehicle approaches from the opposite direction. What should you do?
- If a vehicle travelling ahead of you in the same direction is close, may you use the main beam?
- When is the use of the rear fog light mandatory?
- The front fog light is:
- After driving through a stretch of dense fog with the rear fog light on, visibility improves. What should you do?
- What colour are the direction indicators (turn signals)?
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Frequently asked questions
- What are the three main functions of a vehicle's lighting system?
- To see, to be seen, and to signal A vehicle's lighting fulfils three essential functions: to see the road and surroundings, to be seen by others, and to signal the driver's intentions, such as turning, braking, or reversing.
- When lighting is mandatory and the vehicle is moving, which lights must be switched on as a minimum?
- At least one light to see and one to be seen Whenever lighting is mandatory and the vehicle is moving, it must have at least one light to see and one light to be seen switched on, ensuring the safety of the driver and others.
- During which period of the day is the use of lighting mandatory?
- Between sunset and sunrise Lighting is mandatory between sunset and sunrise, since at night natural visibility is insufficient to drive safely.
- When is lighting considered insufficient for driving?
- When you cannot read a number plate at 10 m nor distinguish a dark vehicle at 50 m Lighting is considered insufficient when you cannot read a number plate from 10 metres or distinguish a dark-coloured vehicle from 50 metres away.
- Is it mandatory to switch on the lighting when passing through a tunnel?
- Yes, whenever driving through a tunnel or underpass In tunnels, underpasses, and stretches signposted as such it is mandatory to switch on the lighting, since natural light suddenly disappears and visibility is reduced.