Government employees and public transit

Freakonomics points out that a New York Times article notes that in Manhattan government workers are the group second most likely to drive onto the island (most likely are workers in "transportation, warehousing and utilities"), likely because they get free parking with their government jobs (and probably many get free use of vehicles).

Kitchen Linker says government employees should be required to take public transit or at least should not get any subsidy for private transportation. This will result in more lobbying for better public transit (who is in a better position to lobby than government employees?), better transit, and more of everyone using public transit, in a virtuous cycle.