Re: [CTPP] Average number of hours spent per year by rush hour drivers

The traffic congestion/delay data is from an analysis that the Texas Transportation Institute does every year for the largest metropolitan areas. They use data that the states submit for the HPMS. The methodology is fairly crude (e.g., highway capacities are national averages, ITS/TDM, etc. isn't factored in, etc.). There was an article I saw where the Washington State DOT decided to stop contributing money for the study, because of these and other limitations. The only way to get a more accurate estimate of actual congestion is through a regional travel model. the short answer is that the ctpp will not get you even close to a comparable number. the census asks usual travel time to work which is not delay. the long answer...one thing that might be of interest to look at would be the ranking of travel time and where the three areas of interest lay in respect to each other. you could do that now with the census data that is already released and on the census bureau's factfinder site http://factfinder.census.gov/. once the ctpp comes out you could also look at either the mean or median travel time by means of transportation to work by time leaving home for work and zero in on just the auto trips by time of day. i am assuming that the delay measure you speak of is only auto trips as opposed to all modes. for a look at what tables will be available in the ctpp head to http://www.fhwa.dot.gov/ctpp/content.htm. (but keep in mind that this is only another number and not directly comparable to your delay value nor should it be considered a surrogate.) i can't think of any other census data that will get you to delay but i am sure if i missed something someone else will chime in. "Spring, Jon R." wrote: stated drivers in information