That part of the urban transportation planning process undertaken to improve the efficiency of the existing transportation system. The intent is to make better use of the existing transportation system by using short-term, low-capital transportation improvements (LCTI) that generally cost less and can be implemented more quickly that system development actions. (TRB) TSM is a funding program for projects designed to make better use of existing transportation rights-of-way. Revenues in this program are generated from the Proposition 111 state gas tax authorizing $1 billion for a 10-year period which is targeted for ready-to-go TSM projects on an annual basis.