Lane Keep Assist

Lane Keep Assist (LKA) is an intelligent driver assistance system designed to encourage safety on the road by helping drivers remain within their lane. This functionality is sometimes referred to as “Lane Centering” in Subaru vehicles. 

Leveraging an advanced setup of cameras and sensors placed around a vehicle’s exterior, an LKA system continuously monitors position relative to road markers and other cars and can detect drifting or crossing into another lane. If the LKA system detects unintentional lane departure, it can alert the driver using visual and auditory cues and even intervene, providing corrective steering so the vehicle maintains a safe position. 

A lane keep assist-equipped vehicle can offer drivers an additional measure of safety accounting for human error, driver distraction, or fatigue that could lead to loss of steering control or a collision. Learn more about this advanced feature and how it works below.

Lane Keep Assist works due to a connected system of sophisticated technologies, including cameras, radar, lidar, and GPS. Strategically placed cameras on a vehicle’s exterior are positioned to monitor its position within a lane. Simultaneously, cameras and sensors near the rear view mirror capture continuous images of the road ahead, identifying center and side lane markers. Through advanced image processing and analysis, they detect any deviations from the intended path that could cross lane boundaries.

This smart technology can tell when a vehicle is drifting and when a move might be intentional by use of the turning signal. When it detects an unintentional departure from the path, the LKA system engages, providing subtle corrective steering inputs to guide the vehicle back into its lane. An LKA system may also issue warnings via a visual indicator on the dashboard or an audible alarm before taking temporary control of steering. 

Unlike a fully automated vehicle, corrective steering from an LKA system is meant to work in cooperation with a driver’s own steering actions. Opposed to taking over entirely, it provides gentle guidance and adjustments to help avoid preventable hazards and avert potential crashes.

Benefits of Lane Keep Assist

Lane Keep Assist provides critical benefits not only to drivers whose cars are equipped with the feature, but to anyone who shares the road with them. Benefits of LKA systems include:

• Enhanced safety: Lane Keep Assist can help prevent unintentional lane departures, reducing risk of a collision.
• Driver fatigue mitigation: LKA systems can alert drowsy drivers if they begin to drift, helping them refocus on the road.
• Peace of mind: LKA can provide drivers with extra confidence when driving in heavy traffic or under challenging road conditions.
• Cooperative steering: An LKA system is meant to work in harmony with a driver’s own actions, supporting them with gentle steering corrections when necessary without fully taking over a vehicle’s operation. In fact, a driver’s own actions will override the LKA adjustments if they deliberately resist the system’s intervention.

Lane Keep Assist can be a valuable feature to help mitigate risk and promote safe driving practices. However, it’s important for motorists to be aware of several considerations when using LKA.

• Drivers can override: A driver can override LKA by using the turning signal or simply refusing the system’s adjustments and proceeding as they intended. The LKA system will never assume total vehicle control from the driver.
• Not infallible: Although LKA is effective when used correctly, it is not completely foolproof and may not function optimally under certain conditions. For example, if a sensor or mirror is disabled or covered with either snow or mud, the system may not be as effective. Drivers must stay attentive even when using Lane Keep Assist and should never rely solely on the system to steer or navigate traffic.
• Requires clear markings: An LKA system relies on clearly visible lane and road markings to work properly. Poorly marked roadways or areas where markings are covered by snow, mud, or a spill may render LKA less effective. Similarly, precipitation and weather conditions may affect the system’s functionality.
• Drivers remain responsible: An LKA system does not replace a driver’s responsibility to remain alert, follow posted traffic rules, and stay engaged in the driving process.