Estimate the pass-by and diverted trip impact generated by a supermarket in Colombo, Sri Lanka

A new supermarket development will produce more trips, adding to the existing traffic and eventually leading to congestion and increasing clashes on nearby roads. One of the primary lands uses in the Colombo area is the supermarket. As a result, it will affect travel demand as well as other local transportation-related concerns. To accurately assess the level of congestion and the effects of the development on the network, it is essential to estimate the actual number of trips that a new supermarket will generate. All land use trips do not just trip to that destination and return (primary trips). Some of the generated trips (pass-by trips) are already in the existing traffic, but some of the generated trips are entirely new (diverted trips). These trips should be analyzed while planning development to determine the impact on the surrounding transport network. Therefore, this research objects to calculate the proportion of primary, pass-by, and diverted trips generated by a Supermarket in Colombo, Sri Lanka. Current vehicle trips attraction/generation of the supermarket, consumer trip chain pattern and vehicle volume of the access road are the primary research input. Five supermarkets in the Colombo area were selected as case studies, and descriptive analysis using SPSS software and Microsoft Excel was used for analysis. Results indicate that on average 43.7% of Pass-by and diverted trips will be generated by a new supermarket in the Colombo area. This paper leads to calculating the real traffic impact by a Supermarket on surrounding road network based on the pass-by and diverted trips in Colombo, Sri Lanka.