This study presents the development of operating speed models for day-time and night-time conditions for highways in Egypt based on a study of 58 horizontal curves at different sites on rural multilane roads. In each horizontal curve, spot speeds at each horizontal curve and tangents between them were collected during the day and night at five points. Spot speeds were collected at the middle of first tangent, point of curve, middle of curve, point of tangent and the middle of second tangent. In the operating speed models, the radius of the horizontal curve was used to estimate the operating speed. The speed models determined that the operating speed correlated with the radius of the horizontal curve. Statistical tests were used to compare daytime and nighttime speeds at the midpoint of each horizontal curve. The comparison reveals that there is no statistical difference between daytime and nighttime speeds at the midpoint of the horizontal curves. Another test was done to investigate the design consistency of the horizontal curves. Comparison between speeds at the main points of the horizontal curve was made. Differences between speeds at point of curve, middle of curve and point of tangent were examined within the tested horizontal curves using ANOVA. The results of ANOVA test for horizontal curves in each group showed that there is no significant difference in speeds between each two successive points within the horizontal curve.
Farrag, M. A., El-Araby, K. A., Mahdy, H. A., & Kandil, K. A. (2018). Development of speed prediction models for day-time versus night-time conditions on rural multilane egyptian highways. International Journal of Engineering and Advanced Technology, 7(4), 112–117.
Mendeley helps you to discover research relevant for your work.