Road Safety Audit after Completion of Road Safety Improvement Project of Bang Khwai Interchange on Motorway No. 7

Abstract

This article presents the results of the road safety audit after completion of the “Road Safety Improvement Project of Bang Khwai Interchange on Intercity Motorway No. 7”.  The project was intended to solve high frequent road accidents at the interchange, especially for trucks and trailers. After the project completion, the road safety audit was conducted together with the collection of accidental records in order to verify the results of the road safety audit and the effectiveness of the project. The results of the study indicated that the main causes of the accidents were inadequate pavement width at the curve and over speeding. It also showed that the problems were effectively solved by lane realignment, pavement widening and installation of various traffic calming devices.