Highway projects are spent down much faster than other types of projects

Obligations refer to legally binding commitments made by the government to spend funds
Outlays occur when the agency actually disburses funds to settle an obligation.

Highway projects, such as highway resurfacing, highway expansion, or other non-emissions-reducing road projects, have outlayed funds much faster than transit, active transportation, or electrification projects. Table describes the average percentage of funds outlayed for for existing project obligations.