Traffic safety is a top-priority area within the EU. By getting vehicles to communicate with one another and using infrastructure in what is known as cooperative systems, it is possible to considerably increase safety levels. “We are already way ahead in the development of this technology. Communication between vehicles is no utopian dream,” says Carl Johan Almqvist, traffic and product safety director at Volvo Trucks.

Imagine sitting behind the wheel of a heavily loaded truck. You are driving on the motorway, a thick fog is beginning to descend and visibility is gradually getting worse. Suddenly you see a car stopped in front of you. You don’t have a chance of braking – the poor visibility prevented you from seeing the traffic tailback before it was too late.

Now imagine being warned well in advance via a display in your truck cab that there is a queue of stopped vehicles in front of you. You can calmly and safely adjust your progress to suit. What is more, your truck automatically passes this information on to other vehicles behind you, which in turn also relay the information to other vehicles behind them.

This scenario is not science fiction but something that will probably become reality. Within the framework of a comprehensive pan-European research project, Safespot, research is now being conducted into how cars and trucks can communicate with one another and how infrastructure can be developed in what is known as a cooperative system for increased traffic safety.

Between 1970 and 2000, traffic on Europe’s roads increased threefold. Every year, about 40,000 people die on Europe’s roads and about 1.7 million people are injured. Apart from the tragedies and human suffering involved, this also costs society enormous sums of money – about 160 billion euros. The EU regards traffic safety as one of the most important social issues on its agenda.

The Safespot project, which is partly financed by the EU, was started in 2006 and today encompasses 51 participants from twelve European countries. Many of the major European vehicle manufacturers are involved, as well as suppliers, universities and road administration authorities, among others. Research is conducted at six test centres in various parts of Europe, including in Dortmund where Safespot’s technical solutions undergo practical testing in urban conditions.

With new solutions in telematics – integrated use of telecommunications and information – vehicles can be made increasingly intelligent. Many trucks, for instance, are already equipped with GPS (Global Positioning System) for navigation, or camera-based systems for lane changing. What is unique about the Safespot project is that with the help of telematics, vehicles will now be able to communicate with each other in a system known as V2V (Vehicle-to-Vehicle). Moreover, it will also be possible for vehicles to communicate with the surrounding infrastructure (V2I, Vehicle-to-Infrastructure) to create a driving support system that enhances active safety.

“This will open the door to an entirely new generation of accident-prevention safety solutions,” says Carl Johan Almqvist, traffic and product safety director at Volvo Trucks.

The Safespot project has defined and tested various applications. Firstly, applications that are based on the vehicle such as safety at crossings, warning of an impending frontal collision, poor road conditions and alerting to the presence of cyclists or pedestrians. And secondly, infrastructure-based applications such as speed warning, information about accidents that have occurred and the creation of safety margins for emergency rescue vehicles. The driver receives this information via a display or sound/light signals in the vehicle. More than that, this information can also be transmitted via signs or flashing lights at the roadside.

The basis of Safespot’s cooperative system is three innovative technologies: Accurate Cooperative Localization, Local Dynamic Maps and Ad-Hoc Communication Networking.

“The aim is to pinpoint position with such precision that the margin of error is less than a meter,” says Johan Fjellström, project manager for the Safespot sector that is handled by Volvo Technology, which among other things develops innovative technical solutions for Volvo Trucks.

Figure 1: Functions being developed by Safespot - Infrastructure Based Warning - Safe Distance & Speed - Blind Spot - Collision Mitigation - Lane Support - Lane Change Support - Side Collision - Collaborative Warning - Rear Detection Photo: Svenska grafikbyrån

In order to achieve the required degree of precision, GPS data is used, along with information from the vehicle’s sensors and knowledge about the exact location of various fixed points in the landscape such as lamp-posts and roads, obtained from the system’s Local Dynamic Map (LDM). LDM is a centralized database and the very heart of the system. It integrates information from a regular digital map with layers of information gathered from other vehicles or from the infrastructure, which is an entirely new way of working.

“The idea is to give the driver advance notification of relevant information about what is happening on the road, based on data from the position and speed of other vehicles, the condition of the road and any obstacles up ahead. In order for this to function safely, it is necessary to have reliable and quick communication in a local network. Safespot uses the standard for Car2Car – the IEEE 802.11p protocol and frequency 5.9 GHz,” explains Johan Fjellström.

Figure 2: Complex communication; There is a lot of information that has to be collected from various sources, including from the vehicle’s own sensors and from VANET (vehicular ad-hoc network), for inclusion in the local dynamic map (LDM) database. The information from this database is analysed and transmitted to the driver, for example in the form of sound and/or light signals or via a display screen. Photo: Svenska grafikbyrån.

The Safespot project’s technical solutions are still at the research stage. Before the project concludes in 2010, a lot of analysis must be carried out. At present it is impossible to say when cooperative systems will be fitted as standard in production vehicles, according to Johan Fjellström:

“It is necessary to achieve a critical mass for this to be effective. Customers must also immediately benefit from the solutions. The cooperative system concept looks very promising and offers many significant benefits. The biggest of all is that the driver can receive information much earlier, even about events beyond the range of his or her own vision including things happening in other vehicles. This would be impossible without the various cooperative systems. What is more, a wide range of safety applications can be covered by one single system – something that would otherwise require many sensors of conventional type, such as radar.”

More information about Volvo Trucks is available at www.volvotrucks.com

Here is the Safespot official web site www.safespot-eu.org/

This article is courtesy of Volvo, Inc.