An estimate of the material quantities can be made after the roadway area has been computed. It should be understood that the actual application rates of binder and aggregate should be based on a design procedure as described in Chapter 4 after aggregate is delivered and before construction starts. For planning purposes, it is only necessary to estimate the application rates of binder and aggregate. While the actual binder rate may vary in the wheelpath versus outside the wheelpath, and the binder/aggregate rate may vary in the travel lanes versus the shoulders, it is only necessary to use an overall average rate for estimating materials. Application rates for any binder and aggregate combination can vary considerably. The estimated application rates should be based on site-specific conditions and local experience.