Quote:
Originally Posted by suburb
The frequency is based on the length of the route divided by number of buses. They can modulate a bit depending on how long the bus needs to remain as the time check point (IE they can make it a longer period by making the bus wait at various points, but they cannot make the period shorter). Other considerations would likely include things like when the trains arrive and/or other connections. The size of bus and/or number of buses are dictated by number of passengers, and sometimes by the nature of the road. On longer routes, they could consider adjusting the route length, making it shorter, to get you to 15 minutes, but I don't think this particular route could get much shorter than it already is. It is an efficient route.
Can't speak to your claim that Edmonton routes all had frequencies of 5/10/15/20/25/30 minutes - I would doubt that, but I could be wrong.
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It's generally true. Edmonton tries to run its routes on a 5, 7.5, 10, 15, 20, 30, 45 or 60 schedule (with 10, 20 and 45 rarely used).
The reason: Edmonton invented to the hub and spoke method of handling a transit system. The Edmonton system is built on major terminals all connected by main routes, with feeder routes from those terminals to the neighbourhoods. To make it work you need to have a gaurenteed timed transfer system. So the mainlines run every 15min in the daytime (and every 7/8 minutes in the peak) with the feeders running every 30 or 60 minutes.
This system is also known as a "pulse network" - all the buses leave the terminals at the same times, a pulse.
The advantaqe is the timed transfers; the disadvantage is the bus frequency might not be perfect for the loads and so costly to add (double the freqency) to keep to the pulse. Another distadvantage is the buses end up waiting at terminals for the next pulse before departing, costing more in bus hours.
Victoria uses a system like Calgary with buses running on various frequencies - we have 24 minutes, 22 minutes, 13 minutes, 9 minutes, etc.
Vancouver runs some suburban routes on the pulse system, but most mainlines run on the best schedule to maximise the use of the equipment.