Improvement of the Protection of Lower Extremities of Vulnerable Road Users in the Event of a Collision with Motor Vehicles

Since the beginning of the testing activities related to passive pedestrian safety, the width of the test area being assessed regarding its protection level for the lower extremities of vulnerable road users has been determined by geometrical measurements at the outer contour of the vehicle. During the past years, the trend of a decreased width of the lower extremity test and assessment area realized by special features of the outer vehicle front end design could be observed. This study discusses different possibilities for counteracting this development and thus finding a robust definition for this area including all structures with high injury risk for the lower extremities of vulnerable road users in the event of a collision with a motor vehicle. While Euro New Car Assessment Program (NCAP)1 is addressing the described problem by defining a test area under consideration of the stiff structures underneath the bumper fascia, a detailed study was carried out on behalf of the European Commission, aiming at a robust, world wide harmonized definition of the bumper test area for legislation, taking into account the specific requirements of different certification procedures of the contracting parties of the UN/ECE² agreements from 19583 and 19984 . This paper details the work undertaken by BASt, also serving as a contribution to the TF-BTA5 of the UN/ECE GRSP6, towards a harmonized test area in order to better protect the lower extremities of vulnerable road users. The German In-Depth Accident Database GIDAS is studied with respect to the potential benefit of a revised test area. Several practical options are discussed and applied to actual vehicles, investigating the differences and possible effects. Tests are carried out and the results studied in detail. Finally, a proposal for a feasible definition is given and a suggestion is made for solving possible open issues at angled surfaces due to rotation of the impactor. The study shows that, in principle, there is a need for the entire vehicle width being assessed with regard to the protection potential for lower extremities of vulnerable road users. It gives evidence on the necessity for a robust definition of the lower extremity test area including stiff and thus injurious structures at the vehicle front end, especially underneath the bumper fascia. The legal definition of the lower extremity test area will shortly be almost harmonized with the robust Euro NCAP requirements, as already endorsed by Global Road Safety Partnership (GRSP), taking into account injurious structures and thus contributing to the enhanced protection of vulnerable road users.


  • English

Media Info

  • Media Type: Web
  • Features: Figures; Photos; References; Tables;
  • Pagination: 13p
  • Monograph Title: 24th International Technical Conference on the Enhanced Safety of Vehicles (ESV): Traffic Safety Through Integrated Technologies

Subject/Index Terms

Filing Info

  • Accession Number: 01570057
  • Record Type: Publication
  • Report/Paper Numbers: 15-0366
  • Files: TRIS, ATRI, USDOT
  • Created Date: Jul 15 2015 6:48PM