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Lane Keeping

When Euro NCAP was established in 1997 as an independent organisation to conduct safety performance assessments on vehicles sold in Europe, the testing was largely on passive safety. Crash tests were highlighted as they showed how good (or bad) a car was when it collided with an obstacle or was rammed from the side. The levels of protection for the occupants within the car were also assessed, including child restraint systems.

As time went by and more advanced safety systems became common, Euro NCAP began adding them to its assessments. For example, in 2011, it began to include Electronic Stability Control (ESC) in ratings and since 2014,Automatic Emergency Braking (AEB) has also been assessed.

Automatic Emergency Braking test

By giving ratings to numerous areas, Euro NCAP has provided a basis of comparison for car-buyers to make more informed decisions. At the same time, because more ‘stars’ suggested a safer car, the manufacturers also aimed to achieve the maximum 5-star rating by ensuring that their new models met the tough test requirements. In this way, Euro NCAP has been continuously pushing the industry to upgrade safety features and systems, benefitting motorists with safer cars.

As Advanced Driver Assistance Systems (ADAS) become more commonly included in new models, the organisation has added Assisted Driving systems to its list. These systems are, however, assessed outside the regular overall rating system. The findings are intended for the information of buyers, giving them a better idea of the effectiveness of the systems advertised.

The tests consist of a series of critical highway driving scenarios, such as typical cut-in and cut-out scenarios, designed to show how effectively the system is able to support the driver in avoiding a possible crash. It also evaluates how driver and system cooperate and how the system ensure that the driver remains engaged in the driving task, avoiding over-trust. Finally, the vehicle’s ability to mitigate the consequences of a crash, referred to as safety backup, is tested, in case an accident is unavoidable.

“We have been publishing Assisted Driving gradings for a couple of years now and we are seeing real improvements in system performance. Most manufacturers realise that it is important that drivers enjoy the benefits of assisted driving without believing that they can hand over control completely to the car, and that’s one of the aspects that our assessment considers,” said the Secretary-General of Euro NCAP, Michiel van Ratingen.

The most recent models tested have been the Jaguar I-PACE, Polestar 2, Volkswagen ID.5 and Nissan Qashqai. While the Jaguar (oldest car in the group) had its system is rated as ‘Entry level’, the new Qashqai stood out in this round of tests. With almost perfectly matched scores for Driver Engagement and Vehicle Assistance, the car’s ProPILOT with Navi Link system demonstrated excellent balance between helping the driver and preventing over-reliance. In the area of Safety Backup, the SUV was said to really excel, with an almost-perfect 93%.

Nissan Qashqai

The assistance technologies in the Volkswagen ID.5, one of the carmaker’s range of BEVs (batter electric vehicles), received a “Very Good” rating, and reached 4 out of 4 possible points – the highest possible score. The testers were impressed by the innovative systems of the ID.5 highlighting maximum comfort and an excellent level of assistance.

In the ID.5, Volkswagen uses innovative, fully connected assistance systems, the optional ‘Travel Assist with swarm data’ being the best example. Within the limits of the system, it can actively keep the vehicle in lane and maintain both the distance to the vehicle in front and the maximum speed set by the driver.

Volkswagen ID.5

Among other things, the system uses the Adaptive Lane Guidance function which actively keeps the vehicle in the middle of the lane. However, ‘Travel Assist with swarm data’ is able to adapt to the driving style and can also keep the vehicle on the right-or left-hand side of the lane.

Euro NCAP starts to assess Highway Assist systems

With more and more vehicles – including those from entry-level brands like Perodua and also pick-up trucks – having advanced driver assistance systems (ADAS), Euro NCAP has started to assess some of the systems which assist driving. The independent organisation tests not only the car’s ability to assist and promote safer driving, but also evaluates how such Assisted Driving systems engage the driver and, if the unexpected happens, what safety back-up is offered by the vehicle.

The present focus is on Highway Assist systems, which help the driver to maintain a steady speed, to keep a safe distance from the car in front and to keep the vehicle in the centre of the lane by combining (intelligent) Adaptive Cruise Control (ACC) with Lane Centering (LC). Highway Assist systems are designed to assist the driver, not to take control, and the driver is expected to keep his hands on the wheel and his eyes on the road at all times.

Adaptive Cruise Control, using camera or radar (or both), maintains a safe gap with vehicles ahead, regardless of the cruising speed set.

The technology, first offered on more expensive premium vehicles over the past 10 years, has gone mainstream in recent years and is now available on cars in all categories, butt with varying degrees of sophistication and at different price points.

Lane Centering systems, using a camera to monitor road markings, help prevent the vehicle from departing from its lane and endanger vehicles in other lanes or go off the road.

In its previous rounds of Assisted Driving tests in 2018 and 2020, Euro NCAP found some vehicles promised more than they could deliver, implying, through their naming and interaction with the driver that they provide more automation than they were capable of doing. All the cars tested in this round, however, offer a balance between Assistance Competence – the degree to which the system can help the driver – and Driver Engagement – the extent to which the driver feels they must remain in control and not disengage from the driving task.

“This balance between assistance and engagement is crucial. Cars are not yet capable of fully automated driving and drivers should not be misled into thinking that they are. Reports from America have highlighted the very serious problems that can happen when people have an unrealistically high expectation of what such systems can offer, and when the car in which they are driving does not actively try to get them back in the loop. We are pleased that the manufacturers represented in this round of tests make clear the level of support that they can provide,” said Michiel van Ratingen, Secretary-General of Euro NCAP.

2022 BMW iX3 EV
BMW iX3 – rated ‘Very Good’ in Assisted Driving assessment.

Euro NCAP’s first Assisted Driving gradings of 7 models equipped with Highway Assist show the overall best performer as the BMW iX3, which was graded as ‘Very Good’. Two others – the Ford Mustang Mach-E and the CUPRA Formentor – achieved ‘Good’ gradings. The assist systems of the Polestar 2 and the Hyundai IONIQ 5 were graded as ‘Moderate’, while the Toyota Yaris and Opel Mokka-e were considered to offer ‘Entry’ level systems.

The BMW iX3, although a variant of the X3 range, has a new sensor set, not yet available on its combustion-engined stablemates and the grading of its automated driving system applies only to the all-electric version. The Polestar 2 achieved a Moderate grading, limited by its performance in Vehicle Assistance. Polestar will perform an over-the-air (OTA) update of the car’s software very soon and Euro NCAP will again assess the car.

2020 Toyota Yaris Gen 4 Europe-Japan model
Even entry-level models like the Toyota Yaris (European model shown) have systems that can provide the driver with a useful level of support, enhancing safety.

The range of cars tested demonstrated the growing prevalence of Assisted Driving across the spectrum of vehicle categories. Entry-level systems, while offering less functionality than more sophisticated ones, nevertheless provide the driver with a useful level of support, and that fact that they are offered on volume-selling cars shows the direction of travel for automated driving.

Euro NCAP’s tests are set against a rapidly changing legislative background. Technology is developing very quickly and the degree of automation that is allowed and what action the car must take when, for example, it tries to hand control back to an unresponsive driver, is being reviewed. The organisation says its future tests will take these regulatory changes into account.

The explosion that saves lives instead of kills…

Euro NCAP, the independent organization which evaluates the safety levels of vehicles sold in Europe, has developed a dedicated test and assessment protocol, as well as a grading system for its Highway Assist tests. These tests are aimed at ensuring the safe adoption of assisted driving technologies and to provide consumers information to make their buying decisions.

Increasingly, vehicle manufacturers have been making use of the sensor-sets fitted to their vehicles to provide more extensive support to the driver. This is a prelude to greater autonomous motoring that will come in future.

Highway Assist
Highway Assist, the general name for a technology designed to make highway driving safer, helps by reducing fatigue. The system can help the driver to maintain a steady cruising speed, and to keep a safe distance from the vehicle in front. Such systems are generally known as Adaptive Cruise Control and can be found on an increasing number of models.

Adaptive Cruise Control can adjust the set cruising speed to maintain a safe gap with a vehicle ahead.

There is also a system to help keep the vehicle within its lane, with sensors monitoring lines on the road for guidance. If the vehicle is found to be departing from the lane, the driver will be alerted and some systems can also exert force to guide the vehicle back into the correct position in the lane.

However, the driver always needs to be responsible and engaged behind the wheel – the assisted system is there to do just that – assist. The systems are not flawless and should not lead or have full control, at least not at this stage in semi-autonomous motoring.

A camera monitors road lines to determine the position of the car in the lane, and the system will alert the driver if the car deviates from the lane.

The test series has so far covered 10 models that offer Highway Assist – the Audi Q8, BMW 3-Series, Ford Kuga, Mercedes GLE, Nissan Juke, Peugeot 2008, Renault Clio, Tesla Model 3, Volkswagen Passat and Volvo V60.

Euro NCAP’s new assessment protocols focus on two main areas: Assistance Competence – a balance between the technical competencies of the system (Vehicle Assistance) and the extent to which it keeps the driver alert and engaged (Driver Engagement) – and Safety Back-up, the car’s safety net in critical situations.

A unique grading system – similar to the 5-star safety rating – helps consumers understand the conclusions of the tests and compare assistance performance at the highest level. Each model falls into one of 4 categories: Entry, Moderate, Good and Very Good.

The findings
Three models in the premium segment – the Mercedes-Benz GLE, the BMW 3-Series and Audi Q8 – were graded Very Good, achieving a good balance between offering a high level of driving assistance but keeping the driver engaged and in control of the driving task. They also provide a good crash avoidance back-up system and respond appropriately if the driver becomes incapacitated while the car is in assistance mode.

BHPetrol RON95 Euro4M

High volume sellers Renault Clio and Peugeot 2008 were both given an Entry grade. Lacking the sophistication of the more advanced systems tested, they provide a relatively modest level of assistance, ensuring that the driver is not disengaged from the driving task.

Tesla’s pioneering role in self-driving technology is reflected in its top scores for Vehicle Assistance and Safety Back-up. However, its Autopilot system was found to do little to keep the driver engaged. Its distinct steering strategy gives the impression that either the car is driving itself or the driver has full control, and the system is more ‘authoritarian’ than cooperative. Grading-wise, the car is badly let down by its performance in Driver Engagement and ended up ranked ‘Moderate’.

The Volkswagen Passat, Nissan Juke and Volvo V60 were also graded as Moderate. In particular, the Volvo, already on the market for a few years, shows that rapid advancements made in driving assistance technology require more frequent updates to keep up with premium cars. Finally, Ford’s latest Kuga achieved a Good grading, demonstrating that well-balanced, advanced systems are also available on mainstream mid-class vehicles.

Improved driver monitoring necessary
“Assisted driving technologies offer enormous benefits by reducing fatigue and encouraging safe driving. However, manufacturers must ensure that assisted driving technology does not increase the amount of harm incurred by drivers or other road-users compared to conventional driving. The best systems offer a balance between the amount of assistance they provide and the level of driver engagement – and should be supported by an effective safety back-up,” noted Dr. Michiel van Ratingen, Euro NCAP Secretary General.

“The results of this round of tests demonstrate that driving assistance is fast becoming better and more readily available, but until driver monitoring is significantly improved, the driver needs to remain responsible at all times.”

Euro NCAP assessments become tougher in 2020 with new protocols

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