Table 2. Marginal cost of additional users, quantifying the sensitivity of the travel time ratio with respect to changes in the capacity ratio.

Metro areas with the top 15 marginal costs are shown.

	passenger vehicles (M)	travel time (min)	capacity ratio	travel time ratio	marginal cost
San Francisco	1.49	34.4	1.73	2.33	3.08
San Jose	0.82	32.6	1.43	1.61	1.76
Oxnard	0.35	24.6	1.43	1.61	1.75
Seattle	1.46	30.7	1.30	1.44	1.33
Boston	1.79	32.0	1.29	1.44	1.30
Lancaster	0.21	22.4	1.28	1.44	1.26
Philadelphia	2.25	28.8	1.28	1.41	1.26
Charleston	0.33	28.6	1.27	1.40	1.23
Los Angeles	5.13	31.7	1.25	1.37	1.17
Stockton	0.27	28.3	1.25	1.41	1.16
Baton Rouge	0.34	28.9	1.22	1.38	1.09
Providence	0.68	23.4	1.21	1.31	1.07
New York	5.16	31.5	1.21	1.34	1.06
Baltimore	1.14	30.2	1.20	1.32	1.03
St. Louis	1.21	26.1	1.19	1.31	1.00