title: Powered two-wheeler drivers' crash risk associated with the use of bus lanes.
abstract: BACKGROUND
  Authorizing powered two-wheeler drivers to drive in lanes reserved to buses is a measure that is sometimes mentioned to improve mobility conditions for these users. But what effect would this measure have on the safety of these users and on the safety of the other users with whom they share the traffic space?
  
  
  OBJECTIVE
  The objective of this study is to contribute elements to help answer this question. More precisely, the objective is to estimate the risk of having an accident per kilometer driven by powered two-wheeler drivers who drive in bus lanes and to compare this risk with that of powered two-wheeler drivers who drive in general traffic lanes.
  
  
  METHODS
  Using the bodily injury accidents recorded by the police over two years on 13 roads in the city of Marseille and a campaign of periodical observations of powered two-wheeler traffic, we estimated the risk per kilometer driven by powered two-wheeler drivers who drive in bus lanes and compared it with that of drivers who do not drive in them.
  
  
  RESULTS
  The results show that the risk for powered two-wheeler drivers who drive in bus lanes of being involved in a bodily injury accident is significantly higher than the risk run by drivers who drive in general traffic lanes. For the 13 roads studied, it is on average 3.25 times higher (95% CI: 2.03; 5.21).
  
  
  CONCLUSIONS
  In the current situation, powered two-wheeler drivers who drive in bus lanes are less safe than those who drive in general traffic lanes. The analysis of police reports suggests that part of this increased risk comes from collisions between automobile drivers turning right and powered two-wheelers driving in the bus lane who continue straight ahead.
authors.affiliation: IFSTTAR, French Institute of Science and Technology for Transport, Development and Networks. Laboratory of Accident Mechanism Analysis, 304 Chemin de la Croix Blanche, Bouches du Rhône, F-13300 Salon de Provence, France. Electronic address: nicolas.clabaux@ifsttar.fr.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Clabaux
authors.affiliation: IFSTTAR, French Institute of Science and Technology for Transport, Development and Networks. Laboratory of Accident Mechanism Analysis, 304 Chemin de la Croix Blanche, Bouches du Rhône, F-13300 Salon de Provence, France.
authors.forename: Jean-Yves
authors.initials: JY
authors.lastname: Fournier
authors.affiliation: IFSTTAR, French Institute of Science and Technology for Transport, Development and Networks. Laboratory of Accident Mechanism Analysis, 304 Chemin de la Croix Blanche, Bouches du Rhône, F-13300 Salon de Provence, France.
authors.forename: Jean-Emmanuel
authors.initials: JE
authors.lastname: Michel
mesh_terms: D000063:Accidents, Traffic / Q000706:statistics & numerical data*; D004779:Environment Design; D005602:France; D006801:Humans; D018986:Motor Vehicles; D009049:Motorcycles; D012306:Risk
keywords: Bus lane; Crash risk; Moped; Motorcycle; Powered two-wheeler