tag:blogger.com,1999:blog-5251183560375528307.post1658342504808803883..comments2024-03-28T21:34:42.328-05:00Comments on Bit Tooth Energy: Gas demand, miles travelled and salt for the roadsHeading Outhttp://www.blogger.com/profile/01790783659594652657noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-5251183560375528307.post-69141171980045362872010-01-10T21:09:27.514-06:002010-01-10T21:09:27.514-06:00The estimates come from the individual states and ...The estimates come from the individual states and traffic meters. To quote the report that I cite above: <br /><br />"Traffic Volume Trends is a monthly report based on hourly traffic count data. These data, collected at approximately 4,000 continuous traffic counting locations nationwide, are used to determine the percent change in traffic for the current month compared to the same month in the previous year. This percent change is applied to the travel for the same month of the previous year to obtain an estimate of travel for the current month.Because of the limited sample sizes, caution should be used with these estimates. The<br />Highway Performance Monitoring System provides more accurate information on an annual basis."Heading Outhttps://www.blogger.com/profile/01790783659594652657noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-41464049675090950482010-01-08T16:48:05.324-06:002010-01-08T16:48:05.324-06:00Mr. Summers -- re Vehicle Miles Travelled, a figur...Mr. Summers -- re Vehicle Miles Travelled, a figure which is in the range of 3 * 10^^12 miles per year. <br /><br />How is that estimated? Is it simply back-estimated from fuel sales, or is there something more tangible behind it? Any idea what the +/- uncertainty in the estimate is? Is the approx 3% drop around 2008 within that margin of uncertainty?Kinuachdrachhttps://www.blogger.com/profile/13275320683766290581noreply@blogger.com