Public Transport Flashcards
What is a passenger table?
A record of how many passengers board, alight and remain riding a public transport vehicle at each stop
How can a passenger table be represented graphically?
Through cumulative boarding and alighting lines
What is the frequency of a public transport system?
Number of vehicles passing in a given time period
Why must you be careful with time calculations?
Different factors will use different units of time
What is headway?
The inverse of frequency (1/f)
What is the headway at which passengers ‘Don’t need to look at timetables’
10 minutes
What is the maximum service frequency over a period T?
T/minimum headway
What is the capacity of a stop for a given time T?
T/maximum of (headway at stop or stopped time at stop)
What is the average wait time at a stop?
Headway/2
How does lower headway affect ridership of public transport?
People become more likely to ride so the catchment of a stop is increased
How does street design affect public transport ridership?
Better designed streets make the walk to a transit stop feel shorter or more enjoyable
How do costs change as headway is decreased?
Passenger cost decreases linearly
Operator cost increases exponentially
What is the total cost of a transit system?
(Operator cost per vehicle * number of vehicles) + (passenger wait cost per hour * total passenger number * headway/2)
What is the equation for optimising headway?
h=sqrt(2cT/vr)
c is operator cost
T is time
v is passenger cost
r is number of passengers
What is the capacity of a transit line?
Number of vehicles * average speed * vehicle capacity / (2 * length of linear route)
