A Review of Safety and Operational Impacts of Various Speed Limits

Speed is the uttermost element influencing the incidence and ferocity of road accidents. The mitigation of the frequency of over speeding is seen as an essential goal for mitigating the number and severity of collisions, and the conventional method for doing so is through posted speed zoning or posted speed limit. Various speed control strategies are now being incorporated on roads to curb accidents’ frequency and risk. Some of the speed control strategies used worldwide are Uniform Speed Limit (USL), Differential Speed Limit (DSL), Variable Speed Limit (VSL), and Lane-Based Speed Limit (LBSL). In this paper, previous research based on the implementation of DSL on different classes of roads at various road stretches has been summarised, and all the conclusions are considered for an upcoming virgin project titled “Determining safety aspects of differential speed limit on Indian roads”.