Table A-4. Federal Subsidies to Passenger Transportation Systems and Modes, Net of User Fees, 1960-1993

b Totals in columns labeled "Total" are sums of entries greater than zero Cumulative lolals in mode specific columns are sums of all numbers in the column Sourcos Nathan Associates Inc See Table A 5 for air carriers and general aviation Table A 6 lor auto, Table A 7 lor bus, Table A 8 for train, and Table A 9 for transit Current dollars deflated to constant 1993 dollars using the implicit price deflator for gross domestic product total governinent purchases from the "Economic. Report of the President *

a Hugulakwy costs are allocated equally to system users and to the public See Table A9 hr calidation of average shares of curst respawn solubles b 1960 1977 by assumption. All others by linear interpolation

chichtes excise tax revenues that remained in the general hand and were not credited to the trust hund

d Just under 20% of this Jotal will be allocated to the general lund under the 1993 DOI Reauthorization Act Sources Nathan Associates Inc Sau lable A 10 for culumn one, Table A 12 for Lukiminis tau and threw. US Congress, Congressional takjet (the Time Status of the Arpurl and Airway Trust Fund December 1988, Department of Transportatiuni, Federal Aviation Adımıustration. "Allocation anul Hacovery ul ederal Arpurt and Airway Costs 1991". Jebruary 1992 atud Factive (We of the Presturit (Whce ol Maragarrart at that. Thuhet of Flute Calator's Cinwonent "bal your 1' and 'p, here, and savan

b 1960 1963 by assumption All others by linear interpolation

Sources Nathan Associates Inc See Table A 11 for column one For columns two and live 1964 shares from "Supplementary Report of the Highway Cost Allocation Study. House Document No 124 89th Congress, 1st Sussion 1965. Table 4. 1969 shares from "Allocation of Highway Cost Responsibility and Tax Payments 1969 US Department of Transportation Federal Highway Administration Bureau of Public Roads May 1970 Table 25 1977 cost and contubution shares and 1985 cost share from

b Excludes $3 8 million in potential subsidies from Section 180) of the Intermodal Transportation Elhciency Act of 1991 (now codified as Section 5311(f) of 49 USC 5301 ETSEQ
c Excludes $6 7 million in potential subsidies from Section 18(1) of the Intermodal Transportation Efficiency Act of 1991 (now codified as Sector 5311() of 49 USC 5301 ETSEQ)
Sources Nathan Associates, Inc See Table A 11 for column one for columns two and live 1964 shares from "Supplementary Report of the Highway Cost

Allocation Study." House Document No 124, 89th Congress, 1st Session, 1965, Table 4, 1969 shares from "Allocation of Highway Cost Responsibility and Tax Payments. 1969*
US Department of Transportation, Federal Highway Administration, Bureau of Public Hoads, May 1970, Table 25 1977 share from "Final Report of the Federal Highway
Cusi Allocation Study US Department of Transportation, Federal Highway Administration, May 1982. Tables VI 10 1978 1984 1992 1993 contribution shares by assumption.
1985 1991 cor bution shares calculated from unpublished Federal Highway Administration data 1986 1993 cost shares by assumption