Varying critical time to collision: a perspective of driver space

Abstract

Cycle Superhighways (CS) are the cycle routes that run between central London and outer London. They were introduced in 2008 as a way to encourage cycling and improve safety. This paper investigates the causal cycling demand and safety impacts arising from the introduction of CS. The analysis uses road traffic and accident data from the Department for Transport in the UK. Propensity score matching and panel outcome regression models are employed and compared to estimate the effects of CS for two different infrastructure types - segregated and non-segregated. Our results suggest that, on average, the intervention had a positive effect on cycle flow volume and cycle accidents, but no statistically significant effect on the cycle accident rate. Nevertheless, we find that segregated CS show a statistically significant decrease in cycle accident rate.