I need to get more information on the Journey to Work questions.  Can you help me understand why only the one-way home-to-work trip is asked for?  Why not the return trip?  Is it correct to double the Census travel times to generalize "the average worker spends 51 minutes a day commuting?"  I would appreciate your input. 
 
The questions arise because we posted the Census data on our web site.  We aggregated the data to our geographies and to a more manageable number of categories.  As you can imagine; radio stations, outdoor advertising companies, and their ad agency and advertiser clients are very interested in commuting info.  If you are interested, you can see the application at http://www.arbitron.com/radio_stations/transportation.htm.
 
Dan Estersohn
Senior Demographer
Arbitron, Inc