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fund would have on hand when the bills come due. There have been some changes since 1956:
1. The superhighways originally were to bypass cities in most cases, with urban connecting links budgeted for only $4 billion. A new; emphasis on urban throughwavs and increased access by more cloverleaf intersections has doubled this. On top of this,.the tremendous cost of urban superhighway construction.an average $4 million per mile......mean$ that 42 per cent of the overall cost of the interstate system involves construction in and around cities. Despite; the money involved, the interstate superhighways represent only 1 Vi ipercent of the total street and road mileage of the nation.
2. Increasing the number <-f planned lanes on many stretches, strengthened construction to carry heavier traffic loads, utility relo cat’on . lighting at some points an | use of a uniform system of large signs has run up cost estimated mo r than $2 billion.
3. Cieneral price rises..inflation .has added another $4 b'.ll.on and mor».
These three factors have tack eld more than $10 billion onto the bill .$9 onto the federal share which must be paid out of federal highway users taxes, but there are
58.8%