Enhancements

If Congress can't agree how to fund the Highway Trust Fund shortfall, Transportation Secretary Anthony Foxx warned state DOTs that he will be unable to reimburse them for funds already spent. The redline is the $4 billion mark projected to come July.
May 11, 2014   The Wall Street Journal - Politics and Policy
As I write this column (2 February) the U.S. House Transportation Committee is debating changes in H.R. 3864, the American Energy and Infrastructure Jobs Opinion
Feb 2, 2012   By Todd Litman
An important current policy debate concerns whether the next U.S. federal surface transportation reauthorization should require spending on "enhancements," which finance projects such as walkways, bike paths, highway landscaping and historic preservation. This issue Opinion
Nov 16, 2011   By Todd Litman
In fact, that's putting it positively, as the battle may already have been lost according to House Transportation Chair John Mica. Enhancements, most of which fund pedestrian and bicyle projects, may become voluntary rather than a requirement.
Oct 28, 2011   The Washington Post