Limited Sight Distance Effect on Speed

by Abishai Polus, (M.ASCE), Lect. in Civ. Engrg.; Dept. of Civ. Engrg., Technion—Israel Inst. of Tech., Haifa, Israel,
Moshe Livneh, (M.ASCE), Prof. and Dean; Dept. of Civ. Engrg., Technion—Israel Inst. of Tech., Haifa, Israel,
Shmuel Borovsky, Research Engr.; Road Safety Centre, Technion—Israel Inst. of Tech., Haifa, Israel,


Serial Information: Transportation Engineering Journal of ASCE, 1979, Vol. 105, Issue 5, Pg. 549-560


Document Type: Journal Paper

Abstract: Sight distance is a basic element of geometric design having a direct bearing on the quality and cost of the designed road. An evaluation is made of speed characteristics as influenced by sight distance at six test sites, each a two-lane rural road. Measures were developed to express the average of driver responses along sections with limited sight distances, and exponential models were constructed to link the measured vertical sight distance to the appropriate response data. Based on the proposed models, an attempt is made to determine the desired sight distance for a design of vertical curves on two-lane roads.

Subject Headings: Sight distances | Traffic management | Distance measurement | Data processing | Geometrics | Site investigation | Rural areas

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