
Variable  Name  Type  Explanation 

 Effective width  Continuous variable  The effective width of bicycle lane 
 Travel speed  Continuous variable  The average travel speed for the survey internal 
 Car volume  Continuous variable  Car volume in the adjacent lane (veh/30 s)^{a} 
 Curb parking  Binary indicator  1 if there are curb parking cars along the bicycle lane, 0 otherwise 
 Retrograde motion  Binary indicator  1 if there are retrograde bicycles in the lane at the observed interval, 0 otherwise 
 Safe gap  Binary indicator  1 if the adjacent lane is clear of moving car, 0 otherwise 
