Resumen
The possibility to implement Advanced Driving Assistance Systems (ADAS) into motorcycle, referred to ARAS (Advanced Rider Assistance Systems), compared to passenger cars might be more difficult. On behalf of ARAS, the On-Bike Information Systems (OBIS) respectively C2X systems offer potential to reduce the amount of motorcycle causalities. Within this study the effectiveness of C2X systems in terms of motorcycle accident prevention is analyzed. The method was divided into two steps. At first the operating range of a C2X system was tested physically at different sites e.g. urban, rural areas and on motorways. The focus was set to the range of an unbroken continuous communication between two passenger cars. Based on the obtained results, for the different terrains, the so called virtual pre-crash simulation was performed. Thus fully reconstructed accident cases with motorcycle participant were analyzed in a case by case study with the assumption that the participating vehicles are equipped with a C2X system. Different intervention strategies by the driver according to a warning signal due to the C2X system were evaluated. Based on the field tests it was found that the operation distance with a continuous communication between the vehicles is influenced significantly from the investigation site. In urban areas the communication distance was up to 369 m at maximum whereas in rural areas 479 m and on motorways a communication distance of 1,118 m were feasible. For the further analysis of motorcycle accidents the 25th percentile operation distance was used to guarantee an uninterrupted signal between the vehicles. Within the analyzed accidents the conflict point was identified at a maximum distance of up to 230 m. That indicates that the conflict starts within the C2X system communication range. The drivers can be alerted to take care of the situation. In total approximately 80% of the accidents could have been prevented if the participants would take an appropriate action i.e. braking.