Technical Evaluation of the TRL Pedestrian Upper Legform

The upper legform impactor was introduced by Transport Research Laboratory (TRL) to address injuries to the upper leg, pelvis, and hip of a pedestrian when struck by a vehicle. The upper legform is instrumented to measure bending moment and force, the two principal modes of injury to a pedestrian in contact with a vehicle’s bonnet leading edge. The upper legform is currently used by the European New Car Assessment Programme (Euro NCAP), Global Technical Regulation No. 9 (GTR 9), and the United Nations Economic Commission for Europe Regulation 127 (ECE R127). The upper legform impactor is new to National Highway Traffic Safety Administration (NHTSA) and was evaluated at its Vehicle Research and Test Center. There are two objectives of this study. Since the foam used in the TRL upper legform impactor has a history of being sensitive to humidity, the first objective is to evaluate the TRL upper legform impactor under different humidity conditions. Qualification tests were performed at the upper end and lower end of the allowed humidity range to see if a humidity change would affect the upper leg performance. Vehicle tests were also carried out under the same conditions to see if the upper legform sensitivity to humidity carries over to vehicle tests. The second objective of this study is to evaluate the TRL upper legform sensitivity to vehicle bumper design, repeatability, reproducibility, durability, and biofidelity.


  • English

Media Info

  • Media Type: Digital/other
  • Edition: Final Report
  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 56p

Subject/Index Terms

Filing Info

  • Accession Number: 01715724
  • Record Type: Publication
  • Report/Paper Numbers: DOT HS 812 659
  • Created Date: Aug 21 2019 9:07AM