If sufficient funds are not available, the program must be reduced administratively in proportion to the imbalance.
The Highway Trust Fund financing mechanism established in the satisfied President Eisenhower's "self-liquidating" demand.
President Eisenhower insisted that the financing mechanism for the Interstate System be "self-liquidating," so that it could not add to the national debt.
The president favored a toll highway network financed by bonds, but his aides convinced him that traffic volumes would not generate enough revenue in most corridors to repay bondholders with interest.
Separate legislation allows the Federal Highway Administration to approve additional mileage if it meets full Interstate standards and would be a logical addition or connection.