http://www.fhwa.dot.gov/planning/census_issues/ctpp/status_report/sr0512.cfm Hi Everyone - Liang Long, our CTPP Technical support said that the Spring Issue of the CTPP Status report would answer your questions. Here is the link. Please see the ftp links! Elaine Murakami FHWA Office of Planning 206-220-4460 (in Seattle)