Semi-autonomous driving
SécuritéAverage price
1500€ - 5000€
Semi-autonomous driving, generally classified as Level 2 on the international SAE scale, represents a major advancement in Advanced Driver Assistance Systems (ADAS). It combines several technologies to assist the driver during specific driving phases, primarily on highways or in traffic jams. The system simultaneously manages acceleration, braking, and steering, keeping the vehicle centered in its lane and at a pre-defined safe distance from the vehicle ahead. To achieve this, the car relies on a suite of sensors: cameras to read road markings, radars to detect other road users, and sometimes lidars for more precise 3D mapping of the environment. Unlike fully autonomous driving (Levels 4 and 5), semi-autonomous driving strictly requires constant driver supervision. The driver must remain attentive, with hands on the steering wheel (or in close proximity), and be ready to resume control at any time. It is a valuable aid that reduces mental load and fatigue, but under no circumstances replaces the driver's judgment and responsibility.
Benefits
- ✓Significant reduction in driver fatigue on long trips and in traffic jams.
- ✓Improvement in active safety by maintaining constant following distances and preventing lane departures.
- ✓Increased driving comfort, offering a calmer and more relaxed experience.
- ✓Traffic optimization through smoother, more anticipatory driving, reducing sudden braking.
Learn more
Semi-Autonomous Driving: Your Technological Copilot
Semi-autonomous driving is currently one of the most sought-after suites of safety and comfort technologies in the automotive market. Often referred to as "Level 2 autonomy," it represents a crucial step toward the fully autonomous car. In practical terms, it allows the vehicle to coordinate speed, distance from other vehicles, and lane centering. It is invaluable assistance that transforms the driving experience, particularly on long highway trips or in monotonous stop-and-go traffic.
How does semi-autonomous driving work?
The magic of semi-autonomous driving relies on sensor fusion from multiple sources. A camera, typically located at the top of the windshield, reads road markings to ensure lane centering. One or more radars, positioned at the front of the vehicle, continuously measure the distance and relative speed of the vehicle ahead. This information is processed by a central computer that controls:
- Adaptive Cruise Control (ACC): It maintains the programmed speed but automatically reduces it to keep a safe distance from the vehicle ahead, coming to a complete stop if necessary (Stop & Go function).
- Lane Keeping Assist (LKA): It applies gentle steering corrections to keep the car centered in its lane.
The combination of these two systems forms the core of Level 2 semi-autonomous driving. The driver activates the system via a steering wheel button and can deactivate it at any time by braking or firmly taking over the steering.
Enhanced comfort and safety, but under supervision
The benefits of semi-autonomous driving are manifold. The primary one is a drastic reduction in fatigue and stress. In a traffic jam, the car handles stops and starts on its own (thanks to the traffic jam assistant), freeing the driver from a repetitive and tedious task. On the highway, the system provides a smoother, more relaxed drive by maintaining a constant speed and trajectory.
In terms of safety, this technology is a major asset. By ensuring optimal following distances and preventing unintended lane departures due to inattention, it helps reduce accident risks. However, it is fundamental to remember that these systems are merely aids. Current legislation and technology require the driver to remain in control of the vehicle at all times, with eyes on the road and hands on the steering wheel, ready to intervene instantly. Steering wheel touch sensors or an interior camera actively monitor this vigilance.
Different names depending on the manufacturers
While the underlying principle remains the same, automotive brands use their own commercial names for their semi-autonomous driving systems:
- Autopilot at Tesla
- Travel Assist at Volkswagen, Audi, or Skoda
- Highway & Traffic Jam Companion at Renault
- Drive Assist Plus at Peugeot and Citroën
- Driving Assistant Professional at BMW
- DISTRONIC with Active Steering Assist at Mercedes-Benz
Available as an option or standard on higher trim levels, semi-autonomous driving has become a key purchasing criterion for many motorists looking for a modern, safer, and more comfortable driving experience.
Finitions équipées
113 finition(s) proposent cet équipement
Hyundai Elantra
Edition One (7th generation CN7) (2021-2022)
Hyundai Genesis
Electrified G80 (Genesis brand) (2022-2026)
Hyundai Ioniq
Executive (Ioniq 6 - 2nd generation line) (2023-2026)
Infiniti Infiniti G
Q60 Premium / Sport (successor to G Coupe - V37 generation) (2016-2022)
Infiniti Infiniti M
S Premium (Q70 transition / M continuity) (2014-2015)
Infiniti Infiniti QX80
QX80 Pure (2nd generation) (2025-2026)
Jaguar Jaguar F-Pace
Edition 1988 (2nd generation) (2023-2024)
Jaguar Jaguar XE
Black Pack / R-Dynamic Black (2nd generation) (2020-2024)
Jaguar Jaguar XE
HSE (2nd generation facelifted) (2019-2024)
Jeep Jeep Compass
Overland (2nd facelifted generation) (2022-2026)
Jeep Jeep Grand Cherokee
Anniversary Edition 4xe (WL Generation) (2023-2025)
Jeep Jeep Wrangler
High Altitude (JL) (2020-2026)
Kia EV9
GT-Line AWD (1st generation) (2023-2026)
Kia Sportage
GT-Line Prestige / High Spec PHEV (5th generation NQ5) (2022-2026)
Kia Stonic
Black Edition (1st facelift generation) (2022-2025)
Land Rover Land Rover Discovery
Landmark Edition (Discovery 5) (2021-2025)
Land Rover Range Rover Sport
Autobiography (3rd generation L461) (2022-2026)
Lexus Lexus LS
LS 500h F Sport Executive (5th generation XF50) (2020-2026)
Lexus Lexus NX
F Sport Premium / F Sport Design (2nd generation) (2022-2026)
Lexus Lexus RC
RC 300h Luxury (2nd facelifted generation) (2019-2022)
Associated equipment
Traffic Sign Recognition
Traffic Sign Recognition (TSR) is an advanced driver assistance system (ADAS) designed to improve driver safety and comfort. Using a front-facing camera, typically located behind the interior rearview mirror, the vehicle continuously scans the road to identify and interpret traffic signs. The captured information, such as speed limits, no-passing zones, or no-entry signs, is then processed by image analysis software. The result is displayed in real time on the instrument cluster or head-up display, allowing the driver to stay informed of current regulations without taking their eyes off the road. The most sophisticated systems can cross-reference this data with GPS navigation system data for increased reliability and even interact with adaptive cruise control or the speed limiter to automatically adjust the vehicle's speed. This technology represents a key step toward semi-autonomous driving by reducing the driver's cognitive load and minimizing risks associated with inattention or poor sign visibility.
Traffic Jam Assist
Traffic Jam Assist is a Level 2 Advanced Driver Assistance System (ADAS) that revolutionizes driving in heavy traffic. It represents a major evolution in active safety systems by merging two key technologies: adaptive cruise control with Stop & Go function (ACC) and Lane Keeping Assist. Designed to operate at low speeds, typically up to 65 km/h (40 mph), this system handles both the longitudinal (acceleration, braking) and lateral (steering) control of the vehicle. Using a front-facing camera and radar sensors, it analyzes the environment, tracks the vehicle ahead, and reads road markings. It thus semi-autonomously manages the following distance, can brake to a complete stop, and automatically resume driving when traffic moves again. Simultaneously, it applies micro-corrections to the steering wheel to keep the vehicle centered in its lane. The primary objective is to relieve the driver of the repetitive and tiring task of stop-and-go driving, drastically reducing stress and the risk of inattention-related collisions, while improving comfort and journey smoothness.
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.
Autopilot
Autopilot is an advanced driver assistance system (ADAS) developed by Tesla that allows the vehicle to autonomously manage steering, acceleration, and braking within its lane. Often associated with full self-driving, it is actually a Level 2 semi-autonomous driving system, meaning the driver must remain vigilant and ready to take over control at all times. The system relies on a suite of sensors, including cameras, radars, and ultrasonic sensors, to analyze the vehicle's 360-degree environment. Basic features include Traffic-Aware Cruise Control, which maintains a safe distance from the vehicle ahead, and Autosteer, which centers the car in its lane. Enhanced versions offer more advanced features such as Auto Lane Change, Navigate on Autopilot, Autopark, and even Summon. Although the name can be misleading, Autopilot is primarily a safety and comfort aid, reducing driver fatigue on long trips and in heavy traffic while increasing safety through reactions that are often faster than a human's.