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· Right-Turn Channelization is a design feature. To estimate the variables required by the LOS models,
· Block Length is a design feature the analyst first collects data on facility design, facility
· Signal Cycle Length is a facility control feature. It is influ- control, facility maintenance, transit service, and the
enced by the facility design, auto and transit volumes, and volume for each mode. The analyst uses these data to esti-
the pedestrian volumes. mate various modal performance characteristics (auto
· Signal Green Time is a facility control feature. It is influ- speed, bus speed, bus wait, bus access, bicycle-pedestrian
enced by the facility design, auto and transit volumes, and conflicts if a shared facility is present, and pedestrian
the pedestrian volumes. density). Once the modal performance characteristics are
known, then the methods of NCHRP 3-70 are used to esti-
Interactions Among Modal LOS Results
mate auto LOS, transit LOS, bicycle LOS, and pedestrian
Exhibit 100 shows the major interactions among the input LOS for the urban street. The bicycle-pedestrian conflict
variable types, the modal LOS models, and the modal LOS LOS is estimated using procedures in Chapters 18 and 19 of
model results. the HCM.
Exhibit 100. LOS Model Interactions.
Facility Facility Facility Transit Mode
Design Control Maint. Service Volumes
Lane Geometry
Bus Boarding Pass.
Auto/Trucks
Bus Stops
Pavement
Bus Headway
Signal Timing
Bike Lane
Pedestrians
Speed Limit
Sidewalk
Bikes
Trees
Bike-Ped
Conflicts
Left Turn Lane
Auto Bus Bus Bus Ped
Speed Speed Wait Access Density
Stops
Delay
Auto LOS Transit LOS Bike LOS Ped LOS
