What is ADAS?

What does 'ADAS' mean?

'ADAS' is the abbreviation for Advanced Driver Assistance Systems. These are systems that support the driver, although their function can vary considerably. Some systems only warn, while others can also brake, steer or adjust speed.

Manufacturers often use different commercial names for similar functions. That is why ADAS Meldpunt, an independent ADAS incident reporting platform, uses the standardised terms from the ADAS Alliantie's 2025 ADAS Glossary wherever possible.

Examples of ADAS

• Autonomous Emergency Braking (AEB) — can brake automatically when the system detects an imminent collision.
• Lane Departure Warning (LDW) — warns when the car is about to unintentionally leave its lane, without steering itself.
• Lane Keep Assist (LKA) — can apply a steering correction to prevent the car unintentionally leaving its lane.
• Adaptive Cruise Control (ACC) — keeps a distance from the vehicle ahead and adjusts speed accordingly.
• Blind Spot Warning (BSW) — warns of vehicles in or near the blind spot.
• Intelligent Speed Assistance (ISA) — helps the driver recognise and keep to the applicable speed limit.
• Traffic Sign Recognition (TSR) — can recognise road signs and display the information to the driver.

This is not a complete list. View all driver assistance systems in the ADAS Glossary.

Is ADAS the same as self-driving systems?

No. Driver assistance systems support the driver, but with current ADAS the driver remains responsible for the driving task. Some systems can temporarily brake, steer or control speed. This does not mean the driver can hand over attention or responsibility to the car. The level of support varies considerably per system and vehicle.

Which ADAS systems are mandatory?

Since 2022, the European Union has applied additional requirements for a range of driver assistance systems to new vehicle types. Since July 2024, many of these requirements have also applied to all newly registered vehicles covered by EU regulation.

For passenger cars and vans, this includes systems such as:

• intelligent speed assistance;
• lane support;
• automatic emergency braking;
• driver drowsiness and attention warning;
• reversing detection;
• emergency stop signal.

From 7 July 2026, additional safety requirements will apply to new passenger cars and vans, including more extensive requirements for automatic emergency braking, pedestrian and cyclist detection and distraction warning.

Not every car therefore has exactly the same systems or functionality. Model year, type approval, vehicle category and specification all play a role.

Why can ADAS be useful?

Driver assistance systems are designed to support the driver and can contribute to road safety — for example by warning of possible danger, automatically keeping distance or braking in a critical situation.

How the system actually performs, however, depends on:

• the driver assistance system;
• the vehicle;
• the driver;
• the environment;
• and the circumstances.

It is therefore important that drivers understand what their systems can and cannot do.

Why do ADAS sometimes react differently than expected?

ADAS process information from sensors and software and must interpret the traffic situation. Possible factors that can affect performance include:

• weather and visibility;
• road markings and infrastructure;
• traffic situation;
• dirt on, or damage around, sensors;
• system settings;
• vehicle speed;
• software;
• sensor calibration or 
  technical faults.

An unexpected reaction does not automatically mean the system is faulty. A single event is often not enough to establish the cause.

Does ADAS also need maintenance?

ADAS must not only be used correctly, but also properly maintained, checked and, where necessary, calibrated. Cameras, radar and other sensors can only work reliably when they are clean, undamaged and correctly aligned.

After, for example, repair work, windscreen replacement or any work involving sensors, a check or calibration may be needed. Software updates can also affect performance. If in doubt, have the system checked by a qualified garage or service centre.

What should you do if ADAS reacts unexpectedly?

The driver remains responsible for the driving task. If a driver assistance system reacts unexpectedly, make sure you keep control of the vehicle. Only once the situation is over and it is safe to do so, note down:

• what the car did;
• which system was active (if known);
• location;
• date and time;
• traffic situation;
• weather and light conditions;
• and any dashboard message.

You can find more explanation of specific situations under ADAS problem, ADAS fault, unexpected braking, Lane Assist not working properly and unexpected steering.

When several reports share similar characteristics, patterns may emerge.

Frequently asked questions