1. Type of street Summer '74 Boston, MA 109 Narrow-busy 2-lanes Bicycle 16.4 (17.3)a3.3 (4.6)aNA Wide-busy 4-lanes Bicycle 14.4 (10.9)a3.5 (1.9)aNA Narrow-light 2-lanes Bicycle 10.1 (8.8)a0.88 (1.5)aNA
2. Commuting period October '74-February '75 Boston, MA 6.0 29 Morning Auto 12.8 -5 Afternoon Auto 13.9 -6
3. City January-March '81 110
4. Weekly travel November '82-February '83 Washington, DC 3.2 45 < 6 h/wk All 5.04 NA ≥ 6 h/wk All 7.90 NA
5. Season May '87-March '88 Los Angeles, CA 108 Summer Auto 6.5 -2.2 2.8 Winter Auto 10.1 -5.8 4.3