Optimization of Airport Shuttle Bus Routes Based on Travel Time Reliability
Table 1
List of influence factors of travel time reliability.
Influence factors
Meaning
Data type
Unit
Road grade
Four types of roads (including highways, expressways, trunk roads, and secondary trunk roads) are considered and marked as 1, 2, 3, and 4, respectively
Integer type
-
Number of driveways
Number of driveways is expressed numerically
Integer type
-
Length of road segments
Distance between two adjacent stations
Floating-point type
m
Number of intersections
Number of intersections along each road segment is expressed numerically
Integer type
-
Traffic flow
Standard traffic flow per hour along each road segment
Integer type
pcu/h
Travel time
Time taken to travel each road segment (i.e., the sum of time traveling on the road and the time of stopping at the intersections)
Floating-point type
min
Travel speed
Average travel speed on each road segment (i.e., length of road segment is divided by travel time)
Floating-point type
m/s
Percentage of cars
Number of cars traveling on each road segment per hour divided by the traffic flow
Floating-point type
-
Saturation
Actual traffic flow on each road segment per hour divided by the traffic capacity
