The High Cost of Free Parking

By Donald Shoup. I haven't read it, but I've seen some reviews:

High Cost of Free Parking reviews
parking subsidy
http://www.examiner.com/review/the-high-cost-of-free-parking-book-review
http://www.nytimes.com/2010/08/15/business/economy/15view.html

"For instance, after including construction and land costs, he measures
the value of a Los Angeles parking space at over $31,000"
"Yet 99 percent of all automobile trips in the United States end in a
free parking space, rather than a parking space with a market price. In
his book, Professor Shoup estimated that the value of the free-parking
subsidy to cars was at least $127 billion in 2002, and possibly much
more. "

And this one is a 2005 essay by Shoup himself:

http://www.sfgate.com/opinion/openforum/article/The-high-cost-of-free-parking-2630493.php

"Paving an entire state for a parking lot sounds outrageous. But because
there are at least three parking spaces for each of the 230 million
vehicles in the United States, the total space devoted to parking in
America amounts to an area about the size of Connecticut. "

"Studies of cruising in downtowns have found that up to 74 percent of
traffic was searching for parking, and the average time to find a curb
space ranged up to 14 minutes. "

"Most cities require commercial buildings to provide a parking lot
larger than the floor area, and for restaurants the parking lots are
often at least three times the size of the dining area. "