Blind Spot Monitor
SécuritéAverage price
400€ - 1800€
The blind spot monitor, often referred to by the acronym BSM (Blind Spot Monitoring), is an Advanced Driver Assistance System (ADAS) fundamental to modern automotive safety. Its role is to monitor the lateral and rear areas of the vehicle that are invisible to the driver via the rearview mirrors or direct vision. To do this, it relies on a network of sensors, typically short-range radars hidden in the corners of the rear bumper or under the outer mirror housings. As soon as a vehicle (car, motorcycle, truck) enters this blind spot, the system alerts the driver. The warning most often takes the form of a light, usually an orange or red icon that illuminates in the outside mirror on the affected side. If the driver engages their turn signal to change lanes while a hazard is present, the alert is intensified by a rapid flashing of the indicator, often coupled with an audible signal or a steering wheel vibration. The most advanced systems, classified as active, can go so far as to apply a slight counter-steering force to discourage the maneuver and prevent a collision. Particularly effective on high-speed roads and in dense traffic, this technology has become an essential safety standard, significantly reducing the risk of lane-change accidents.
Benefits
- ✓Active prevention of collisions during lane changes.
- ✓Significant reduction in driver stress and cognitive load.
- ✓Increased safety for two-wheelers (motorcycles, bicycles), which are often difficult to spot.
- ✓Improvement of overall situational awareness, especially on highways and in dense traffic.
Learn more
What is the blind spot monitor?
The blind spot monitor, also known as the blind spot monitoring system or by its acronym BSM, is an Advanced Driver Assistance System (ADAS) designed to overcome an inherent limitation in the design of any vehicle: blind spots. These 'blind spots' are areas around the car that the driver cannot see either directly or through the rearview mirrors. The system's purpose is to continuously monitor these critical areas to alert the driver to the presence of another road user before initiating a lane change maneuver, thereby drastically reducing the risk of a side collision.
How does this technology work?
The operation of the blind spot monitor relies on a set of sensors. Most commonly, these are short-wave radar sensors (typically 24 GHz or 77 GHz) invisibly integrated behind the rear bumper on each side of the vehicle. Some older or simpler systems may use ultrasonic sensors, similar to parking assist systems, or even cameras housed beneath the exterior side mirrors.
These sensors continuously 'scan' an area extending several meters along and diagonally behind the vehicle. When a moving object (car, motorcycle, etc.) is detected entering this predefined area, the electronic control unit analyzes its speed and trajectory to determine if it represents a potential hazard. If so, an alert is triggered.
The different types of alerts and systems
There are primarily two levels of blind spot monitoring systems:
- The passive system: This is the most common form. When a vehicle is in the blind spot, a illuminated icon (often orange or yellow) lights up in the glass of the corresponding exterior rearview mirror or sometimes on the door pillar. This is a discreet visual notification that remains active as long as the hazard persists.
- The active system: In addition to the visual alert, this system responds to the driver's intention to maneuver. If the driver activates their turn signal on the side where a vehicle is detected, the alert intensifies. The icon begins to flash rapidly and is accompanied by an audible warning (beep) or haptic feedback (steering wheel vibration).
- The intervention system (or active blind spot monitoring): The most advanced level. If, despite the warnings, the driver persists in their maneuver and a collision risk is imminent, the system can intervene directly. By acting on the Electronic Stability Program (ESP), it can apply a slight steering correction to guide the vehicle back into its lane and avoid an impact.
Benefits and limitations of BSM
The main advantage of the blind spot monitor is a dramatic increase in safety. It prevents thousands of accidents every year, particularly on highways where lane changes are frequent. It is especially valuable for detecting two-wheeled vehicles, which can easily 'hide' in a blind spot. Furthermore, it reduces driver fatigue and stress by eliminating the need for excessive head-turning to check behind, thereby improving comfort and concentration on the road ahead.
However, it is crucial to remember that BSM is a driving aid and not an autopilot. Its effectiveness can be reduced by extreme weather conditions (heavy rain, snow) or if the sensors are obstructed by mud or ice. Direct visual checks, the classic 'shoulder check', remain an essential safety reflex before any lane change.
Finitions équipées
84 finition(s) proposent cet équipement
Renault Renault Master E-Tech
Z.E. Business+ (1st facelifted generation) (2019-2021)
Renault Renault Symbioz
Evolution+ / Equilibre (1st generation) (2024-2025)
Renault Renault Trafic E-Tech
Techno (Trafic III E-Tech) (2023-2026)
Seat Seat León
Xcellence (Leon III / 5F) (2017-2020)
Seat Seat Tarraco
Style (1st generation - Phase 1) (2019-2020)
Seat Seat Tarraco
Xperience (1st generation - Facelifted Phase 2) (2021-2024)
Toyota Toyota C-HR
Collection (1st generation) (2017-2023)
Toyota Toyota C-HR
Design (1st facelifted generation) (2019-2023)
Toyota Toyota Prius
Lounge Pack Techno (4th generation XW50) (2017-2021)
Volkswagen Volkswagen ID. Buzz
Style (1st generation) (2023-2026)
Volkswagen Volkswagen ID.4
Life (1st generation) (2021-2023)
Volkswagen Volkswagen ID.7
Life (1st generation) (2023-2024)
Volkswagen Volkswagen Passat
Carat (B7) (2010-2014)
Volkswagen Volkswagen Sharan
Highline (2nd generation, phase 2) (2015-2022)
Volkswagen Volkswagen T-Cross
IQ.DRIVE (1st generation special edition) (2021-2023)
Volkswagen Volkswagen Touran
IQ.DRIVE (2nd generation) (2019-2022)
Volvo Volvo EC40
Core (C40 Recharge / 1st generation) (2021-2024)
Volvo Volvo S80
Summum Luxury / Pack Luxury (2nd generation) (2013-2016)
Volvo Volvo V90
Inscription (SPA / current generation) (2017-2021)
Volvo Volvo XC70
Summum (facelifted phase 2 XC70 II) (2013-2016)
Associated equipment
360° Cameras
The 360° camera system, also known as 'panoramic view', 'Surround View' or 'Bird's Eye View', is a sophisticated Advanced Driver Assistance System (ADAS) that reconstructs a complete aerial view of the vehicle's immediate surroundings. It typically consists of four strategically positioned ultra-wide-angle (fisheye) cameras: one in the front grille, one on the tailgate or trunk, and one under each exterior rearview mirror. The video feeds from these cameras are transmitted in real time to a dedicated Electronic Control Unit (ECU). The ECU processes, corrects distortions, and digitally stitches the images together to create a single, cohesive, real-time composite view displayed on the central infotainment screen. This top-down view is often complemented by dynamic guidance lines that indicate the vehicle's trajectory based on the steering wheel angle. Designed to operate at low speeds, this system is an invaluable asset during parking maneuvers, navigating tight spaces, or detecting low obstacles that are invisible from the driver's seat, thereby drastically reducing the risk of scrapes and collisions. It is an increasingly widespread feature, transitioning from the premium segment to mainstream vehicles.
Rear Cross Traffic Alert
Rear Cross Traffic Alert, often referred to by its English acronym RCTA, is an Advanced Driver Assistance System (ADAS) designed to make reversing maneuvers safer. Its primary function is to detect vehicles, cyclists, or pedestrians approaching from the sides when the driver is backing out of a perpendicular parking space or a garage with limited visibility. To achieve this, the system uses radar sensors, typically integrated into the corners of the rear bumper. These sensors scan a wide area on each side of the vehicle, well beyond the driver's direct field of view or that of a standard rearview camera. When a hazard is detected, the system triggers a multi-modal alert to warn the driver. This alert can be audible (a series of beeps), visual (a pictogram on the infotainment screen or flashing lights in the side mirrors), and sometimes haptic (a vibration in the steering wheel). The most advanced versions of this system can even initiate automatic emergency braking to prevent an imminent collision if the driver fails to react in time. This technology is an essential complement to traditional parking sensors and the rearview camera, providing a crucial layer of active safety in urban environments and crowded parking lots.
Active Blind Spot Monitoring
Active blind spot monitoring, also known by trade names such as Blind Spot Assist or Side Assist, is an Advanced Driver Assistance System (ADAS) designed to prevent collisions during lane changes. Unlike a simple blind spot detector that merely alerts the driver (visual alert in the rearview mirror, audible alert), the active system is capable of intervening directly in the vehicle's trajectory. Using radar sensors located at the rear of the vehicle, the system continuously monitors areas that are difficult for the driver to see. If a vehicle is detected in the blind spot while the driver engages their turn signal to change lanes, an initial alert is issued. If the driver ignores this alert and begins the maneuver anyway, the active system can apply corrective steering torque or light braking to the wheels on the opposite side to subtly yet firmly guide the car back into its original lane and thus avoid an imminent collision. This technology represents a major evolution in safety, moving from mere information to true preventive action, significantly reducing the risk of accidents related to inattention on highways or in heavy traffic.
Lane Keeping Assist
Lane Keeping Assist, often referred to by the acronym LKA, is an Advanced Driver Assistance System (ADAS) designed to prevent unintentional lane departures. Using a camera, typically located behind the rearview mirror, the system continuously detects road markings (solid or dashed lines). If the vehicle begins to drift and approaches a line without the turn signal being activated, the system actively intervenes. Unlike a simple Lane Departure Warning (LDW) system, which only provides an audible or vibrating alert, Lane Keeping Assist applies a slight counter-steering torque to the steering wheel to smoothly guide the vehicle back toward the center of its lane. Some more advanced systems may also use selective braking on the opposite wheels to correct the trajectory. This feature, which is primarily active at speeds above 60-65 km/h, is a valuable aid on highways and expressways, reducing the risks associated with distraction or drowsiness. However, it is not an autonomous driving system; the driver must keep their hands on the steering wheel and remain in control of the vehicle at all times.
Adaptive Cruise Control (ACC)
Adaptive Cruise Control, known by the acronym ACC, is an Advanced Driver Assistance System (ADAS) that represents a major evolution from standard cruise control. While the latter merely maintains a fixed speed, ACC intelligently and automatically adjusts the vehicle's speed to maintain a pre-set safety distance from the vehicle ahead. To achieve this, it relies on sophisticated front-mounted sensors (radar, LiDAR, and/or camera) that continuously analyze traffic. If the vehicle ahead slows down, ACC commands deceleration, up to activating the brakes. As soon as the road is clear, it accelerates again to reach the set speed. The most advanced systems, known as "Stop & Go", even manage complete stops in traffic jams and automatic restarts, offering unparalleled comfort in dense traffic. By automating distance and speed management, ACC reduces the driver's mental workload, lowers the risk of rear-end collisions, and improves traffic flow, serving as a fundamental technological building block for semi-autonomous driving.