The bio-blurb states that Miss Leavitt became aware that something was amiss with our highway programs when one threatened to bisect her living room, and if her anti-macadam tirade is exhaustingly non-stop, it is perhaps understandable. The theme, by this time, is an old friend (or enemy): more roads mean more cars, congestion and pollution. Communities are destroyed by capricious planning; the fat cats comprising the highway lobbies get fatter and the little man doggedly creeps to work bumper-to-bumper. The author's main target is the Highway Trust Fund, a bottomless treasure chest for the highway exponents since highways are now not subject to competitive pressures for funding. She examines the present mass transit proposals--among them Nixon's, Volpe's, Koch's--and concludes that committing funds separately to mass transit as to highways would again shove aside the claims of schools, health programs, etc.; general funding is indicated. Her suggestions for curtailing cars in favor of improved mass transit are in general restatements of increasingly vocal proposals by some urban leaders. But the question remains--who is to bell the Cadillac? Congested.