Traffic Performance Measures on Two-Way Two-Lane Rural Highways

The most appropriate service measure for a two-lane highway is the combination of average travel speed (ATS) and percent time spent following (PTSF). local driver behavior traffic operation characteristics in different countries affect operational analysis results. objective this study to evaluate applicability HCM procedures on highways Iraq. Ten segments northern Iraq were selected, more than 28,000 vehicles observed record characteristics.
 results show that low flow rates, HCM-2000 tend overestimate ATS with an amount 0.0085VP, while moderate-to-high underestimate 0.0025VP considered. Moreover, PTSF; as well, decreases PTSF, density, follower density increase under study. Equations are developed evaluation performance