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This study analyses micro-level and macro-level traffic parameters at merging location on high-speed urban roads in India. The study at such location is important because it is a potential bottleneck location and a source of traffic crashes due to the competition of two traffic flows for the same space. The study is conducted at a merging location on eight-lane divided high speed urban roads. Such merging operation is quite common on the entire roadway and hence, one representative section was selected. Due to the presence of merging on the study section, speeds were found to gradually decrease from median side lane to lane closer to merging point. A significant reduction in the speed of different vehicle categories was found due to merging location. The percentage reduction lies in the range of 4% to 14%. The effect of location parameters on headway is studied at upstream of merging, at merging and basic section (which is 1km away from merging location). It is inferred that the upstream of merging location is also affected due to the merging operation. At low and moderate flow conditions, most of the vehicles avoid moving in lanes closer to merging point in the main traffic stream. This is done to reduce the crash as well as to avoid competing for the same road space. The macroscopic speed-flow relationship developed for basic roadway section and merging section shows the difference in capacity by almost 8% due to the presence of such kind of merging operation. This shows how the roadway section goes unutilized due to the presence of such kind of merging maneuver. A multilinear regression model is developed in present study which shows stream speed at the location of merging and is found to be the function of main stream flow and entry flow. These findings study would be useful for operational analysis and development of simulation model at merging sections of similar type on multilane urban roads in India, which enhances the scope of design of competent merging location, which can reduce the effect on mainstream capacity and stream speeds. The present results may be further extended to minimizing negative impacts of merging vehicles on the mainstream traffic by applying several control strategies so that traffic operation and capacity at such type of merging locations can be improved.

Examining Traffic Flow Parameters at Merging Section on High-Speed Urban Roads in India