Car Technology

How Lane Departure Warning Prevents Accidents

2 min read

A lane departure warning, often abbreviated to, LDW, is a system that alerts the driver when the car is about to crossover or leave the lane that the car is currently travelling in. If the indicators have been activated the system usually ignores the departure and does not provide the driver with a warning.

Many cars are sold with both the lane departure warning system and the lane-keeping assistant, as the systems work easily together.

Are There Any Issues with a Lane Departure Systems?

If a driver has learned to ignore the warnings, they can become complacent and choose not to notice the warnings. The system can struggle to identify lane markers and merging lane markers, and while the driver should use their indicators when merging many do not, so the system can become more of an annoyance rather than a corrective measure.

When drivers are using a car that has LDW installed they are recommended to use indicators every time they move from a lane, even if it to pass a cyclist or other small slow moving objects, as if the car operates corrective measures (due to an LKA system) is may force the car into an otherwise avoidable accident.

The system has been known to lose sight of the road markers in wet weather, or if the markers are dull and/or faded.

Many drivers find LDS to be annoying rather than helpful, and it has been noted that up to 45% of drivers have chosen to switch the system off.

How Does LDW Prevent Accidents?

There are times when a driver may not be operating at their peak alertness and the car can drift in the lane. This is where the LDW comes into its own and alerts the driver of an imminent, and unplanned lane change.

Research has shown that having an active LDW system can reduce sideswiping accidents by as much as 11%.

The system can also assist in making sure the car does not veer off the road and onto the shoulder, possibly damaging the car on guardrails.

How Does The LDW Work?

Usually, it starts working at speeds above 50km/has this is the speed where when an accident occurs the driver, and passengers can be injured. In general, many safety systems are there to prevent injury to passengers rather than protect the car from damage.

The LDW deploys a system of sensors and cameras to read the road. It uses sophisticated software to identify the road markers and plot them as the car travels. It can identify turns and rises and falls in the road. If a few of the markers are missing it can, up to a point, fill in the gaps.

If the car veers too closely to the markers the system will offer an audible warning to alert the driver, and the driver generally has two options: they can steer the car back into the lane or they can activate the indicators. At which time the LDW warnings will disengage. If the driver refuses to deploy corrective actions the car may perform a correction. However, this can be overturned by the driver by using more force on the steering wheel..

How To Tell If Your Car Has LDW?

You can perform a search of an online database of vehicles. This will usually give you enough information about the car in question as to if it has an LDW system, or alternatively you can seek out the manufacturer, or talk to the owner of the vehicle.

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