Modelling Free Flow Speed on Two-Lane Rural Highways in Bosnia and Herzegovina

free flow speed rural roads curvature characteristics space mean speed gradient

Authors

  • Ivan Lovrić
    ilovric@sve-mo.ba
    University of Mostar, Faculty of Civil Engineering, Bosnia and Herzegovina
  • Dražen Cvitanić University of Split, Faculty of Civil Engineering, Architecture and Geodesy, Croatia
  • Deana Breški University of Split, Faculty of Civil Engineering, Architecture and Geodesy, Croatia

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Free flow speed is used as a parameter in transportation planning and capacity analysis models, as well as speed-flow diagrams. Many of these models suggest estimating free flow speed according to measurements from similar highways, which is not a practical method for use in B&H. This paper first discusses problems with using these methodologies in conditions prevailing in B&H and then presents a free flow speed evaluation model developed from a comprehensive field survey conducted on nine homogeneous sections of state and regional roads.