Product Code Database
In road-transport terminology, a lane departure warning system ( LDWS) is a mechanism designed to warn the driver when the vehicle begins to move out of its lane (unless a turn signal is on in that direction) on and . These systems are designed to minimize accidents by addressing the main causes of collisions: driver error, distractions and drowsiness. In 2009 the U.S. National Highway Traffic Safety Administration (NHTSA) began studying whether to mandate lane departure warning systems and frontal collision warning systems on automobiles.
There are four types of systems:
Another system is the emergency lane keeping (ELK). The emergency lane keeping applies correction to a vehicle which drifts beyond a solid lane marking.
Without those LSS systems, lane departure can be unintentional; the car drifts towards and across the edge of the lane. The car then reach a potentially dangerous situation. This system does not work when the edge of the lane is not marked by a line.
A lane detection system used behind the lane departure warning system uses the principle of Hough transform and Canny edge detector to detect lane lines from realtime camera images fed from the front-end camera of the automobile. A basic flowchart of how a lane detection algorithm works to help lane departure warning is shown in the figures.
Lane warning/keeping systems are based on:
In Europe, the lane departure warning system should be compatible with a visible lane marking identification standard such as commission regulation EU-351/2012.
The first production lane departure warning system in Europe was developed by the United States company Iteris for Mercedes-Benz Actros commercial trucks. The system debuted in 2000, and is now available on many new cars, SUVs, and trucks.
In 2002, the Iteris system became available on Freightliner Trucks' North American vehicles. In both these systems, the driver is warned of unintentional lane departures by an audible rumble strip sound generated on the side of the vehicle drifting out of the lane. No warnings are generated if, before crossing the lane, an active turn signal is given by the driver.
Fiat is launching its lane keep assist feature based on TRW's lane keeping assist system (also known as the haptic lane feedback system). This system integrates the lane-detection camera with TRW's electric power-steering system; when an unintended lane departure is detected (the turn signal is not engaged to indicate the driver's desire to change lanes), the electric power-steering system will introduce a gentle torque that will help guide the driver back toward the center of the lane. Introduced on the Lancia Delta in 2008, this system earned the Italian Automotive Technical Association's Best Automotive Innovation of the Year Award for 2008. Peugeot introduced the same system as Citroën in its new 308.
Lane departure warning systems combine prevention with risk reports in the transportation industry. Viewnyx applies video-based technology to assist fleets in lowering their driving liability costs. By providing safety managers with driver- and fleet-risk assessment reports and tools, it facilitates proactive coaching and training to eliminate high-risk behaviors. The Lookout Solution is used by North American fleets, and there is research on implementing a lane departure warning system via a mobile phone. (2026). 9783642115769 ISBN 9783642115769
Two separate studies found that lane-keeping systems and blind spot monitoring systems had lower crash rates than the same vehicles without the systems. Police crash data from 25 states between 2009 and 2015 for vehicle models where the systems were sold as optional reduced rates of single-vehicle, sideswipe, and head-on crashes by 11 percent, and injuries in such crashes by 21 percent. The sample size was not large enough to control for demographic and other variables.
While the combination of these features creates a semi-autonomous vehicle, most require the driver to remain in control of the vehicle while it is in use. This is because of the limitations associated with the lane-keeping feature.
The lane keeping assist system is being achieved in modern vehicle systems using image processing techniques called Hough transform and Canny edge detection techniques. These advanced image processing techniques derive lane data from forward facing cameras attached to the front of the vehicle. Real-time image processing using powerful computers like Nvidia's Drive PX-series are being used by many vehicle OEMs to achieve fully autonomous vehicles in which lane detection algorithm plays a key part. Advanced lane detection algorithms are also being developed using deep learning and neural network techniques. Nvidia has achieved high accuracy in developing self-driving features including lane keeping using the neural network based training mechanism in which they use a front facing camera in a car and run it through a route and then uses the steering input and camera images of the road fed into the neural network and make it 'learn'. The neural network then will be able to change the steering angle based on the lane change on the road and keep the car in the middle of the lane.
A lane keeping assist mechanism can either reactively turn a vehicle back into the lane if it starts to leave or proactively keep the vehicle in the center of the lane. Vehicle companies often use the term "lane keep(ing) assist" to refer to both reactive lane keep assist (LKA) and proactive lane centering assist (LCA) but the terms are beginning to be differentiated.
In 2020, UNECE released an automated lane keeping system (ALKS) regulation which include features such as lane-keeping and adaptative speed for specific roads up to 60 km/h.
Allows unassisted driving under limited conditions
Vehicles
Requires driver control while vehicle is in use, but adjusts steering if vehicle detects itself drifting out of lane ((LKA) refers to reactive "lane keep(ing) assist" and (LCA) refers to proactive lane centering):
List shows up to 2015 model year. This feature has become more widespread since then, as seen below.
2013 Ford Ford Explorer Fusion Lincoln Lincoln MKS Lincoln MKZ Toyota Prius 2014 Acura Acura RLX Acura MDX Ford Explorer Fusion Ford Taurus Infiniti Q50 LCA Lincoln MKS Lincoln MKT MKZ Mercedes-Benz E-Class S-Class Toyota Prius 2015 Acura Acura TLX LCA Acura MDX LCA Audi A3 LCA A6 LCA Audi TT LCA Cadillac Cadillac ATS Chrysler 200 300 Dodge Dodge Charger Ford Ford Edge LKA Explorer LKA Ford Galaxy F-150 LKA Fusion LKA Taurus LKA Honda Honda CR-V LCA Hyundai Hyundai Genesis LCA i40 LCA Lincoln Lincoln MKC LKA MKS LKA MKT LKA MKZ LKA Mazda Mazda6 LKA Mazda CX-5 LKA Mercedes Sprinter Škoda Octavia III LKA Toyota Prius Volvo Cars XC90 II LKA 2014 Tesla Motors Model S Part of the Tesla Autopilot system released in 2015, retroactively added by software upgrade to hardware capable 2014 vehicles. This combines automatic lane change (after signal is applied), adaptive cruise control, and sign recognition to regulate speed and location. Infiniti Q50 Available fly-by-wire (Direct Adaptive Steering) autonomous steering, lane keeping (Lane Assist), (Intelligent Cruise control) adaptive cruise control, and Predictive Forward Collision Warning system 2015 Mercedes-Benz C-Class, E-Class, S-Class Autonomous steering, lane keeping, adaptive cruise control, parking, and accident avoidance. Semi-autonomous traffic assistant for speeds up to . Tesla Motors Model S, Model X This is the Mobileye EyeQ-powered Tesla Autopilot system. This system combines automatic lane change (after signal is applied), adaptive cruise control, and sign recognition to regulate speed and location. Volkswagen Passat Part of the driver assistance pack plus in the new VW Passat B8. It contains a traffic jam assist which is active up to . This system steers, brakes, and accelerates. Another part is the emergency assist which takes complete control over the vehicle when the driver does not react anymore. The vehicle is brought autonomously to a complete stop without any driver intervention. Not offered in the North American market Passat. Volvo Cars XC90 II Part of the Pilot Assist system. The system is active up to and steers, brakes, and accelerates the car on its own. It relies on the adaptive cruise control sensing a car in front and clear lane markings to be present. 2016 Audi Audi A4 Semi-autonomous traffic assistant marketed as "Traffic Jam Assist" offered as an option. Tesla Motors Model S, Model X This is the Mobileye EyeQ3 autopilot system released in 2015. This system combines automatic lane change (after signal is applied), adaptive cruise control, and sign recognition to regulate speed and location. Volvo Cars S90 II, V90 II,
XC90 IIPart of the Pilot Assist II system. The system is active up to and steers, brakes, and accelerates the car on its own without needing a car which to follow. The driver is required to confirm his presence in regular intervals for the system to stay active. 2017 Tesla Motors Model S, Model X, Model 3 2017 is the first year of the release of the second generation Autopilot 2 system using the Drive PX-series hardware. This combines automatic lane change (after signal is applied), adaptive cruise control, and sign recognition to regulate speed and location and also makes use of 8 cameras, one radar, and several ultrasonic sensors. Volvo Cars XC60 II Part of the Pilot Assist II system. 2018 Volvo Cars XC40, S60 III, V60 II Part of the Pilot Assist II system.
Prevalence
Lane keeping assist is mandatory for new cars and vans in the
UNECE regulation 130 does not require LDWS of heavy vehicles to work under 60 km/h or to work in a curve with a radius lower than 250 meters.Regulation 130, Uniform provisions concerning the approval of motor vehicles with regard to the Lane Departure Warning System (LDWS)
Lane departure warning systems also face many legal limitations regarding autonomous driving. As stated previously, this system requires constant driver input. Vehicles with this technology are limited to assisting the driver, not driving the vehicle. Lane departure warning systems biggest limitation is that it is not in complete control of the vehicle. The system does not take into account other vehicles on the road and "cannot replace good driving habits".
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