A quick guide to ADAS
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A quick guide to ADAS

A quick guide to ADAS

As the world’s leading automotive companies continue to develop safer, future-ready vehicles, Advanced Driver Assistance Systems, ADAS for short, will become increasingly common place. Here we talk you through the main systems available on the market today. And just how these smart, connected technologies are helping to both assist drivers, and improve road safety.

Anti-Lock Brake Systems (ABS): Standard on many vehicles today, ABS prevents the wheels from locking up during emergency stops, by detecting differences in wheel speeds, and then rapidly pulsing the brakes until the wheel is turning at the same speed as the others.

Brake Assist (BA): BA or Emergency Brake Assist (EBA), is designed to recognise an emergency brake, by using data from the decelerometer and front radar or ultrasonic sensors. If the driver has not applied sufficient force, the emergency braking system kicks in, working in conjunction with the ABS, to provide extra braking power. 

Electronic Stability Programme (ESP): Also known as Electronic Stability Control (ESC), ESP is designed to reduce the risk of skidding by applying the brakes to the relevant wheel(s), and decreasing engine power, if it detects an over or understeer when cornering, an evasive manoeuvre or a sudden change in road conditions or traction. Note, it’s important to have any accessories i.e. a tow bar, fitted and programmed correctly. When a trailer or caravan is connected, the ESP is automatically configured to consider the additional weight load and distribution.   

adaptive cruise control

Adaptive Cruise Control (ACC): Otherwise known as autonomous cruise control, active cruise control, intelligent cruise control or radar cruise control, ACC automatically adjusts the vehicle’s speed to maintain a safe distance from traffic ahead.  Most systems automatically turn off below a certain speed, however, some offer a ‘Stop & Go’ or ‘Queue Assist’ function for use in slow-moving traffic.

Forward Collision Warning (FCW):  Also referred to as a collision avoidance or collision mitigation system, FCW continually monitors the road ahead to detect objects in the vehicle’s path, such as pedestrians, animals or other vehicles. In the event of an imminent collision, the system warns the driver through audio or visual signals, so that they can take evasive action i.e. by applying the brakes or steering. 

Autonomous Emergency Braking (AEB): AEB is an evolution of the collision warning system. Instead of providing just a warning to the driver, it engages the braking and/or steering, without driver input, to help lessen the impact of a crash, or even prevent it from happening in the first place. 

Lane Departure Warning (LDW): LDW systems are designed to prevent drivers from unintentionally straying out of their lane. If the system detects that the vehicle is drifting, without any appropriate signals, it generates an audio-visual alarm so that the driver can take corrective action.

Lane Keep Assist (LKA): LKA or Lane Keeping Systems are a step on from Lane Departure Warning systems. Rather than simply warning a driver of a lane departure, LKA corrects the line of travel automatically, steering it back into position without any driver input.  Some vehicles also have an advanced version of this called Adaptive Lane Guidance. This constantly makes adjustments to keep the driver in the centre of their lane at all times. 

lane change assistance

Lane Change Assistance: Commonly known as a Blind Spot Detection or Blind Spot Awareness, it monitors the area around a vehicle for any lane movement. If the system determines that it’s unsafe to change lanes, because of another vehicle in the intended lane, especially in the driver’s blind spot, it signals an alarm. 

Intelligent Speed Assistance/Adaptation (ISA): ISA helps the driver to maintain a safe and/or legal speed. If the vehicle exceeds this limit, the system will either alert the driver, or take action to reduce the speed by limiting engine power.

Traffic Sign Recognition (TSR): By scanning the road ahead, TSR helps drivers identify upcoming road signs such as changes in speed limits or potential hazards. The system interprets the sign and relays it onto the dashboard and/or infotainment display, in order to alert the driver.

Adaptive Headlights: Using input on the vehicle’s steering, speed and elevation, adaptive headlight technology keeps the vehicle’s headlights on the road at all times. As well as improving visibility in low-light conditions, it also reduces glare for oncoming drivers.

Tyre Pressure Monitoring Systems (TMPS): TMPS warns the driver if one or more tyres are underinflated by measuring either the rate of revolution of, or pressure within, each tyre. As well as improving safety, the system helps to reduce emissions and fuel usage.
Night Vision: Featuring thermographic cameras, night vision systems can detect objects beyond the reach of the vehicle’s headlights, alerting the driver to potential collisions in low-light or poor weather conditions. 

Parking Assistance: One of the more common ADAS technologies, parking assistance ranges from rear view cameras that simply provide audio or visual signals to the driver on the proximity of any obstacles, to fully autonomous systems that physically steer the vehicle into and out of the space. 
Driver drowsiness:  Also called driver awareness detection, these systems can detect the onset of fatigue by observing the driver's behaviour at the start of and during every trip. If any signs are spotted the system sends a warning signal to the driver. 

ADAS systems are classified as levels 1 – 5 by the Society of Automotive Engineers, the following is a guide to those levels.

Level

Definition

Guidelines

0

No automation

Driver warning or minor intervening

1

Hands on

The driver and vehicle share control, example Adaptive cruise (ACC, TACC)

2

Hands off

The automated system may take full control, the driver must be ready to intervene immediately

3

Eyes off

The driver can turn their attention away from driving, the driver must be able to take over given reasonable notice

4

Mind off

The driver may do other tasks ie. go to sleep, this maybe in pre-determined geofenced areas

5

No steering wheel required

No driver is required