[ClaytonA]

Interesting how experience closely correlates with academic studies of previous experience. Even the first % increases are pretty close:

http://globalnews.ca/news/3737799/tr...t-mann-bridge/

... On Sept. 5, during the first day back to school, traffic on the Port Mann Bridge reached 148,000 vehicles. That’s compared to 119,000 the same day a year before.

That’s a 24 per cent increase in traffic.

...

“That bridge has been under-utilized for a very long time. I’m not surprised given the tolls are off the numbers are up, but I don’t think they’ve escalated to the point where the diversion puts it in an arena of real concern yet.”

Hepner said traffic volumes are up between 25 and 30 per cent compared to when the tolls were in place. ...

https://web.archive.org/web/20170914...of-congestion/

... planners estimate that, in major cities, there is up to a 30 percent volume of ”œlatent” traffic in the system. Latent traffic consists primarily of people who would like to take a trip at a given time, but have chosen not to because of congestion. Because of this latent traffic, any increase in the carrying capacity of the road network will be instantly absorbed, as the decrease in travel time brings new drivers onto the road. (Hence the saying that building new roads to ease congestion is like loosening your belt to cure obesity.) ...