This node is splitted according to the ACT variable. For accidents involving pedestrians (with or without obstacles), accident severity is KSI. Whereas, for all other accident types, the tree splits by the variable lane width. In lanes narrower than 6m (narrow lanes), accidents are KSI in 61.11% of cases. In lanes wider than 6 m, severity with light or heavy rain is SI with a probability of 62.26%, depending on ATF variable.