I think it would be interesting to try charting vehicle miles against energy % of GDP. I think I saw something along those lines, but not sure when or where. Fuel price, even inflation adjusted, may not represent a good measure for behavior change. I suspect that the real drivers of reduced miles may a) reduced discretionary income (because more going to energy), and b) reduced demand (which can also be caused by the inflationary effects of higher energy costs relative to income). It would also be interesting to see whether different industrial regions (across countries/economies and within) pull back on travel at similar or different levels of energy costs.

Brian

I think TOD should begin maintaining an archive of raw data, like excel or cdf files of various parameters versus time. A seperate portion of the website dedicated to data would provide a really good resource for future discussions. Some TOD posters are good a data mining particular fields; having one place where all this information is stored would really improve the site.

Anecdotal evidence isn't of much use when you can check the updates on Traffic Volume Trends released monthly (around the 20th) by the FHWA. Here is my chart of US VMT by sector:

Note that the downturn is primarily in the rural sector, urban areas continued growing until last year.