A Motorcyclist-Injury Severity Analysis: A Comparison of Single-, Two-, and Multi-Vehicle Crashes Using Latent Class Ordered Probit Model

•Latent Class Clustering and Ordered Probit models are integrated to explore the major factors impacting on motorcyclist injury severities significantly.•Subgroups based on the number of involved vehicles and homogeneous classes help to uncover insightful information hidden in the general model.•Injury measurement method based on New Injury Severity Score (NISS) assesses multiple injuries of motorcyclists.•Pre-speed of the motorcycle is found to be a main factor associated with serious and critical injury in most types of crashes.