TY - JOUR ID - 71206 TI - Traffic Flow Characteristics of Isolated Off-ramps in Iranian Expressways JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Vaziri, M. AD - Civil Engineering, Sharif University of Technology Y1 - 1998 PY - 1998 VL - 11 IS - 3 SP - 135 EP - 146 KW - Transportation engineering KW - Traffic Flow Characteristics KW - Highway Capacity Analysis KW - Ramp Junction DO - N2 - The purpose of this study was to investigate traffic flow characteristics at off-ramp junctions in Iranian expressways. The study was conducted on the traffic behavior in isolated off-ramp vicinity of 6-lane expressways. The database consisted of traffic flow and traffic speed information extracted from videotapes. The relationship between diverging traffic flow in the right lane of expressway with total expressway and ramp flows was investigated. The 1985 U.S. Highway Capacity Manual, the 1985 HCM, models, and numerical values for isolated off-ramp analysis were evaluated and modifications for Iranian expressway system were suggested. The speed -flow relationship study showed that for a developing country such as Iran, the developed country's transportation engineering and planning manuals such as the 1985 HCM could give misleading results. Highway capacity analysis should be adjusted for a developing country's prevailing traffic composition and driver behavior.   UR - https://www.ije.ir/article_71206.html L1 - https://www.ije.ir/article_71206_0e9fd21dd7a5024b15497b16d1bbc2ed.pdf ER -