I really subscribe to the concept of fare-free public transport (FFPT) on an ideological level. But having gone through a lot of the evidence, I'm now less convinced that it actually accomplishes its transport goals.
From a transport perspective, FFPT is basically assumed to do two things:
1. Improve transit trips
2. Reduce car trips
For (1), although there are some improvements like faster boarding, FFPT falters in high-ridership situations like rush hour. You see this in places like Melbourne, where the downtown's free tram zone worsens overcrowding. Normally, high ridership is a good sign, but with free transit, the lion's share of new ridership is coming from people who'd have otherwise walked or biked over a short-distance trip. So sticking with the Melbourne example, trams get overcrowded with people going 1km, and leave those going 20km on the platform.
Point (2) is related to this. Most people don't avoid transit because it's expensive, or rather don't drive because it's cheap. In places where it exists, FFPT has had a pretty minuscule effect on rates of driving. If tried in busier places, I think it might even drive (pun!) people away from transit for the same reason I brought up for point (1); If your bus is overcrowded and stops on every block for people going short trips that could've been walked or biked, then your 20km trip is slower, more crowded, and less reliable. And of course even if it did divert some car trips, the induced demand from the freed-up space on the roads would make it all moot anyhow. No matter how many times public officials like to tout it, public transit just doesn't reduce congestion. It can reduce the rate of growth of congestion, it can create more trips, it can do all sorts of excellent, necessary things, but it just won't reduce car congestion.
Basically, FFPT's problem is that it diverts short trips from walking/biking, which negatively affects longer trips whose only alternative is driving. This is mostly a problem when space in a bus/subway is scarce and valuable, like rush hour. I think that most of FFPT's problems could be overcome by just limiting it to off-peak hours. So maybe taking the subway 7-10am is $4, but it's free (or at least cheaper) off-peak. That sort of arrangement could even help ease existing overcrowding at peak, and justify better off-peak service to match the less spiky ridership.
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I've always struggled with reality. And I'm pleased to say that I won.
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