Automatic emergency braking (AEB) systems are designed to detect potential collisions and automatically apply the brakes if the driver does not respond in time. This technology aims to mitigate or prevent accidents by reducing impact speed or avoiding the collision entirely.
How automatic emergency braking systems operate
AEB systems typically use a combination of sensors, including radar, lidar, and cameras, to monitor the road ahead. These sensors continuously scan for obstacles such as other vehicles, pedestrians, and cyclists. When a potential collision is detected, the system first issues a visual and audible warning to the driver. If the driver fails to react, or if the system determines that a collision is imminent, it can apply the brakes autonomously.
The sophistication of AEB systems varies. Basic systems might only detect other vehicles, while more advanced versions can identify vulnerable road users like pedestrians and cyclists, even in low-light conditions. The system's ability to detect and react to different types of obstacles is crucial for its effectiveness. For instance, a journey from Brussels to Cologne might involve urban driving, where pedestrian and cyclist detection is critical, followed by motorway sections where vehicle-to-vehicle collision avoidance is paramount.
Regulatory framework and standardisation
The implementation of AEB systems in new vehicles sold in the European Union is mandated by the EU General Safety Regulation (Regulation (EU) 2019/2144). This regulation specifies that all new types of vehicles introduced from July 2022, and all new vehicles sold from July 2024, must be equipped with certain advanced driver-assistance systems, including AEB. The regulation aims to enhance road safety by making these technologies standard.
Further technical specifications and testing procedures for AEB systems are outlined in UNECE Regulation No. 171 on driver-control assistance systems. This regulation provides a harmonised framework for the approval of AEB systems, ensuring a consistent level of performance across different manufacturers and markets. Compliance with these regulations is a prerequisite for vehicle type approval in the EU.
Euro NCAP testing and ratings
Euro NCAP, an independent vehicle safety assessment programme, plays a significant role in evaluating the real-world performance of AEB systems. Euro NCAP's Safety Assist protocols include rigorous tests for AEB systems, assessing their effectiveness in various scenarios. These tests go beyond the minimum regulatory requirements, providing consumers with a more comprehensive understanding of a vehicle's safety performance.
Euro NCAP tests AEB systems for car-to-car, pedestrian, and cyclist scenarios. The results are incorporated into the vehicle's overall safety rating, which is published to help consumers make informed purchasing decisions. A higher Euro NCAP rating for Safety Assist indicates a more robust and effective AEB system. Buyers can consult Euro NCAP's website for detailed test results and ratings for specific vehicle models.
Limitations of automatic emergency braking
While AEB systems significantly enhance safety, they have inherent limitations. Sensor performance can be affected by adverse weather conditions such as heavy rain, snow, or fog, which can obscure the sensors or interfere with their readings. Similarly, direct sunlight or low-light conditions can challenge camera-based systems.
The speed at which AEB systems can effectively prevent or mitigate a collision also has limits. While they are highly effective at lower speeds, their ability to prevent collisions diminishes as speeds increase. At higher speeds, AEB is more likely to reduce the impact severity rather than prevent the collision entirely. Drivers should also be aware that AEB systems are designed as an assistance feature and do not replace the need for attentive driving. The system's response time and braking force are calibrated to intervene when a collision is likely, but human judgment and intervention remain critical.
Driver interaction and system verification
Drivers need to understand how their vehicle's AEB system operates and what its specific capabilities and limitations are. This information is typically detailed in the vehicle's owner's manual. The manual will explain how to activate or deactivate the system (if permissible), interpret warnings, and understand the conditions under which the system may not function optimally.
To verify the specific AEB capabilities of a vehicle, buyers should consult the official documentation provided by the manufacturer, such as the owner's manual or the vehicle's technical specifications. These documents will specify the types of obstacles the system is designed to detect (e.g., vehicles, pedestrians, cyclists) and the operational speed ranges. For instance, some systems might only operate up to a certain speed for pedestrian detection, while others might offer broader coverage. Euro NCAP ratings also provide a reliable, independent assessment of a vehicle's AEB performance.
The role of eCall in post-collision safety
While AEB focuses on preventing or mitigating collisions, the eCall system complements it by enhancing post-collision safety. Mandated in all new type-approved cars and light commercial vehicles in the EU since April 2018, eCall automatically dials the European emergency number 112 in the event of a serious road accident.
The system transmits the vehicle's exact location, the time of the incident, and the direction of travel to the nearest emergency services. This rapid notification can significantly reduce emergency response times, which is crucial for saving lives and reducing the severity of injuries. For example, if an AEB system mitigates a collision on a remote section of a cross-border journey, eCall ensures that emergency services are dispatched promptly, even if the occupants are incapacitated. The combination of AEB and eCall therefore addresses both pre- and post-collision safety aspects.
