Professor Dr. Hubert Mantz from Ulm University of Applied Sciences, one of the heads of the "Salus" project, explains the background: "Car manufacturers are installing driver assistance systems, starting with high-end models, but it will take a long time before such aids are available in all vehicle models. Similarly, assistance systems are now being installed in high-end motorcycles, but lack of space makes it difficult to reach the level of car-based systems there. The aim of our project is to install small sensor units at the roadside that can detect hazards and report them to approaching vehicles. In addition, for road users without reception systems, street lighting can be switched on to highlight the danger area and/or warning signs can be activated. Our system detects and warns of the hard-to-detect dangers on country roads and should significantly improve traffic safety".
The current demonstration system can process data from three sources simultaneously - radar, optical cameras and infrared cameras. Additional sensors could be integrated to measure air pollution levels, for example, which has already attracted commercial interest from companies in the project consortium. The Salus project envisages the use of the stand-alone units on roads in Germany, mounted on piles at the roadside, which means that they must be cost-effective and solar-powered.
The communication system between the units, which will be installed at the roadside, must also be designed for low power so that it can be powered by solar cells. A LoRaWAN (Long Range Wide Area Network) is therefore used, as this standard is characterised by low power consumption and is based on licence-free frequency bands, so that no further costs are incurred. A LoRaWAN provides a range of up to 40 km in rural areas, which is more than sufficient for the installed units to function together as one large warning system.