As the Highway Trust Fund slips toward a deficit, the U.S. Dept. of Transportation has laid out a detailed plan to conserve its cash by slowing down aid distributions to states in August.

DOT Secretary Anthony Foxx notified state DOTs on July 1 that unless Congress adds revenue to the trust fund, his department will cease its current daily reimbursements on Aug. 8 and instead shift to twice-a-month distributions.