Induced demand - discussion

[ozbob]

Induced Demand & Roadway Widening: Everything You Always Wanted to Know (and Weren't Afraid to Ask)

[ozbob]

Induced demand

> https://en.wikipedia.org/wiki/Induced_demand

[ozbob]

How highways make traffic worse

[ozbob]

Induced Demand Explainer
( Excerpts from ABC Australia program Utopia ..  )

[#Metro]

Demand is inducible on both road and PT systems. It's just that on PT systems it maxes out later and the increase in usage leads to more frequency, which is a good thing. On roads it leads to more congestion, which is a bad thing.

Here's how I would reconceptualise the issue. It's doesn't seem to be a problem with modelling. Rather, when faced with predicted large volume increases, authorities seem to still be choosing a low capacity mode to handle these volumes - Car Rapid Transport (CRT) - rather than known higher capacity systems (BRT, LRT etc).

How else does one explain a prediction for 152,000 vehicles per day in 2036 for the Centenary Bridge; which is a flow of about 182,400 people/day. But apparently there isn't enough to fill a BUZ service to Centenary?   How does that make sense?

The theoretical line capacity for the CRT mode is 2160 passengers/hr/direction. Why choose that when almost everything else has a higher throughput?

I can only guess this is the case due to perceiving people as either 'Motorists' or 'PT' users and not realising that the transport authority has agency to exercise about which mode is going to be used to meet demand.

The bit that appears to be missing from the 'modelling' is the conscious decision part.


(Note - own adaption)

Notes

Urban Transport Systems A Transport Australia Society Discussion Paper, Engineers Australia, December 2021
https://www.engineersaustralia.org.au/sites/default/files/2022-01/Urban-Transport-Systems-TAS-Discussion-Paper-December-2021-revised.pdf

[verbatim9]

Just a repost here from the other thread on the Centenary discussion.

When the time comes, as with all freeways around the world they will eventually need to introduce T2 and T3 lanes but this has been very hard to police in the past. I guess with modern policing technology it could be a success a second time around.