What are Advanced Driver Assistance Systems (ADAS)?

Electronic technologies that assist the driver and improve road safety ADAS are electronic technologies that use sensors, cameras, and radars to improve road safety, reduce accidents, and assist the driver, minimising human error.

What percentage of road accidents is attributed to human error, the problem ADAS aim to reduce?

Over 90% Human error is responsible for over 90% of road accidents. ADAS are designed precisely to minimise that error through alerts and interventions.

What characterises a passive ADAS system?

Alerts the driver to danger without intervening Passive systems alert the driver to potential dangers without intervening in the driving, such as lane departure warning or traffic sign recognition.

What does an active ADAS system do, unlike a passive one?

Intervenes by taking control to prevent the accident Active systems take control when necessary to prevent an accident, such as automatic emergency braking or adaptive cruise control, whereas passive ones only warn.

What function does the Automatic Emergency Braking (AEB) system perform?

Brakes automatically if the driver does not react to an obstacle AEB detects obstacles using cameras, radar, or lidar and, if the driver does not react in time, first warns and then applies the brakes to avoid or reduce the collision.

Driver Assistance Systems (ADAS)

Study all Driver Assistance Systems (ADAS) questions for the Spanish DGT theory test.

Reviewed on 7 Oct 2026

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How can ADAS systems contribute to fuel efficiency?
Which factor can impair the correct operation of ADAS cameras and sensors?
What risk does over-reliance on ADAS systems carry?
For ADAS systems to work correctly, what care do their cameras and sensors require?
Since July 2024, what does the European Union require regarding certain ADAS systems in newly registered vehicles?
Which of the following systems has been mandatory as standard on all newly registered vehicles in the EU since July 2024?
In the practical test for the Class B licence in Spain, what is permitted regarding vehicles with ADAS systems?
What do vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communication technologies enable in the evolution of ADAS?
As a best practice when using ADAS systems, what attitude should the driver always maintain?
What is the core message about the role of ADAS systems in driving?

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Frequently asked questions

What are Advanced Driver Assistance Systems (ADAS)?: Electronic technologies that assist the driver and improve road safety ADAS are electronic technologies that use sensors, cameras, and radars to improve road safety, reduce accidents, and assist the driver, minimising human error.
What percentage of road accidents is attributed to human error, the problem ADAS aim to reduce?: Over 90% Human error is responsible for over 90% of road accidents. ADAS are designed precisely to minimise that error through alerts and interventions.
What characterises a passive ADAS system?: Alerts the driver to danger without intervening Passive systems alert the driver to potential dangers without intervening in the driving, such as lane departure warning or traffic sign recognition.
What does an active ADAS system do, unlike a passive one?: Intervenes by taking control to prevent the accident Active systems take control when necessary to prevent an accident, such as automatic emergency braking or adaptive cruise control, whereas passive ones only warn.
What function does the Automatic Emergency Braking (AEB) system perform?: Brakes automatically if the driver does not react to an obstacle AEB detects obstacles using cameras, radar, or lidar and, if the driver does not react in time, first warns and then applies the brakes to avoid or reduce the collision.