Ah nostalgia! I worked on this for a while back in Commuting in Am I and again in II. The way the question is worded all drivers respond to 1 and all psgrs to 2 that means that sovs are in 1 and so are the drivers of the carpools. If all carpools are 2 person carpools then an equal number of drivers as carpoolers are in drivers. The numbers were PRIV DRI 50697919 65.97% PRIV PSG 9024631 11.74% ALL POV 59722550 77.71% Thus max carpoolers come out to about 23% of POV. This sets max vehicles (50.7 meg vehs) and would place min. vehicle occupancy at about 1.18; with a distribution like 80 it would have been higher. Probably the peak days of carpooling absent WW II. See table 3-6 of CIA II. Alan -----Original Message----- From: ctpp-news-bounces(a)chrispy.net [mailto:ctpp-news-bounces(a)chrispy.net] On Behalf Of Patty Becker Sent: Thursday, February 05, 2004 5:55 PM To: William Schaefer; ctpp-news(a)chrispy.net Subject: Re: [CTPP] 1970 census transportation mode to work data I am looking at a reproduction of the 1970 questionnaire. It's item 29d, in the 15 percent sample only. It reads: How did he [note the old sexism] get to work last week? Fill one circle for chief means used on the last day he worked at the address given in 29c. Driver, private auto Passenger, private auto Bus or streetcar Subway or elevated Railroad Taxicab Walked only Worked at home Other means (specify)__________________ I would be willing to bet that all SOV respondents are in the first category. In the rare instance of a carpool, a respondent would put him/herself in the first category if they drove on the last day, and in the second category if they did not. Remember, this was before the first big energy crisis and carpooling wasn't very common back then. On the other hand, public transit was used a lot more than it is now! Sorry--I had a birthday yesterday and I am reminded once again that I was indeed mostly a SOV driver in 1970. Patty Becker At 04:42 PM 02/05/2004, you wrote: ---------------------------------------------------------------------------- --------------------- Patricia C. (Patty) Becker 248/354-6520 APB Associates/SEMCC FAX 248/354-6645 28300 Franklin Road Home 248/355-2428 Southfield, MI 48034 pbecker(a)umich.edu _______________________________________________ ctpp-news mailing list ctpp-news(a)chrispy.net http://www.chrispy.net/mailman/listinfo/ctpp-news