Table 11
Weekday Regional Trips per Household by Vehicle Ownership Level
San Francisco Bay Area: 1965, 1981 & 1990 Household Travel Surveys

Vehicle Ownership Year Percentage
of Households		 Home-Based Non-
Home-Based		 Total
Work Shop/
Other		 Social/
Recreation		 School
No vehicles
1965 14% 0.940 1.139 0.562 0.493 0.778 3.912
1981 11% 0.724 1.159 0.629 0.541 0.942 3.996
1990 10% 0.869 1.120 0.371 0.513 1.015 3.890
% Diff. 65-90 -8% -2% -34% 4% 30% -1%
One vehicle
1965 44% 1.669 2.430 1.022 0.891 1.606 7.618
1981 35% 1.298 1.738 0.974 0.577 1.713 6.301
1990 32% 1.378 1.442 0.571 0.473 1.620 5.484
% Diff. 65-90 -17% -41% -44% -47% 1% -28%
Two vehicles
1965 34% 2.233 3.452 1.469 1.488 2.471 11.113
1981 36% 2.211 2.661 1.412 1.062 2.754 10.101
1990 37% 2.234 2.133 0.941 0.796 2.261 8.366
% Diff. 65-90 0% -38% -36% -47% -8% -25%
Three vehicles
1965 6% 2.782 3.992 1.905 1.616 2.979 13.274
1981 12% 2.789 3.246 1.827 1.600 3.314 12.776
1990 14% 2.685 2.562 1.096 1.148 2.903 10.394
% Diff. 65-90 -3% -36% -42% -29% -3% -22%
Four-or-more vehicles
1965 2% 3.214 4.291 2.002 1.647 3.509 14.663
1981 6% 3.684 3.054 2.008 1.880 3.954 14.580
1990 7% 3.748 2.422 1.526 1.229 3.408 12.333
% Diff. 65-90 17% -44% -24% -25% -3% -16%
All households
1965 100% 1.858 2.732 1.184 1.098 1.906 8.778
1981 100% 1.890 2.274 1.262 0.952 2.335 8.713
1990 100% 1.991 1.891 0.827 0.744 2.100 7.553
% Diff. 65-90 7% -31% -30% -32% 10% -14%