Hunter, William W.
Nadia Mohamed Rashad
Kenneth D. Cross
Roman F. Beck
James M. Green
R. H. Breeze
H. G. Wells
Kristin Hardy
Saul Raisin
Christopher Wormell
Unknown Author
Healy, Mark.
S. M. Watkins
Western Australia. Road Traffic Authority. Research and Statistics Division.
Allott & Lomax (Firm)
Jane Atkinson
Virginia Pedestrian/Bicycle Safety Team.
Ingenieurbüro für Verkehrswesen Dr.-Ing. R. Koehler, Dipl.-Ing. B. Leutwein.