Now don't get me wrong, I understand the value of a public good. Grocery stores receive food via trucks on roads, so even non-drivers get the benefit of the road. The parking subsidy, however, is insidious because it's so much less visible. It's not a government investing in a public good: the city instead requires businesses to maintain off-street parking, and they pass that cost on to everyone. It lets everybody believe that parking, and driving altogether, is much cheaper than it really is, because the (actually enormous) parking costs are hidden away and subsidized by those who don't use it.