Unless Congress acts to reinstate the pretax benefits, there will be a bias in favor of automobile commuting, with public transit commuters only able to set aside $125 a month, and auto commuters allowed up to $240 a month. This subsidizes the more polluting automobile over the cleaner and more energy efficient use of buses, trains and automobiles. See
http://www.washingtonpost.com/local/transit-users-await-congressional-action-on-pretax-benefits/2011/12/06/gIQArG6IlO_story.html