I have discovered a new product. It is called Fast Measure. No more hanging out the window of your truck with your old measuring wheel. Developed by a paving professional for the paving industry, it can also be mounted on crack routers & concrete saws for accurate job accounting. It can save you hours on your estimating and job layout. According to Ernie Kaplin the inventor it is more accurate than a standard walking wheel or your vehicle odometer (odometers can be off by more than 1/10th of a mile).
Website is: http://www.fast-measure.com/_pages/pr_fast_measure.htm