1. Elefteriadou L. Torbic D. and Webster N. (1997). “Development of passenger car equivalents for freeways two-lane highways and arterials ” Transportation Research Record . 1572 Transportation Research Board Washington D.C. 51–58.
2. Eurostat. (2000). Eurostat yearbook 2000—The statistical guide to Europe European Union Brussels Belgium.
3. Golias J. C. and Karlaftis M. G. (2001). “A methodology for assessing the impacts of specialized vehicles on the traffic stream ” Proc. 2001 Transportation Research Board Annual Meeting Transportation Research Board Washington D.C.
4. Huber M. J. (1986). “Estimation of passenger-car equivalents of trucks in traffic stream.” Transportation Research Record. 869 Transportation Research Board Washington D.C. 60–69.
5. Effect of Light-Duty Trucks on the Capacity of Signalized Intersections