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> Expanding highways increases throughput almost everytime. Certainly, it rarely ends congestion. It often reduces congestion, That turns out not to be the cas
by stonogo 5y ago
> Expanding highways increases throughput almost everytime. Certainly, it rarely ends congestion. It often reduces congestion,
That turns out not to be the case. Road widening almost always worsens congestion. http://plazaperspective.com/road-widening/ http://plazaperspective.com/road-widening/
People never complain about throughput. People complain about trip times, and road widening never helps that.
- toast0 5y agoHere's some stats from a Los Angeles area project. http://boardarchives.metro.net/BoardBox/BB2015/2015_05_May/150526_I_405_Sepulveda_Pass_Improvements_Project_Evaluation.pdf http://boardarchives.metro.net/BoardBox/BB2015/2015_05_May/1... Have a look around page 18. Time with congestion was reduced by about 2 hours daily from before the project to after the project. There's also several charts of trip times in there, although some of them are comparing different times of the year which is less apples to apples IMHO. If exhibit 4-133 from the report after the slides is a good comparison, the congestion was effectively eliminated; however the before is during construction, and it's a single day, so that's a bit hard to take at face value; I'm guessing they didn't have any/enough saturday data from the 2009 before construction data set to compare with.