<p><p><h2>Commentary</h2>Quantifying the cost of compaction using high energy impact rollers is difficult. In simplest terms, the capital investment plus depreciation and maintenance costs must be pro‑rated over a given amount of embankment compaction. Availability of high energy impact rollers in the U.S. is limited at this time. As a one-time trial, investment in an additional fixed cost is typically not feasible. On the other hand, when spread over a number of projects, a capital investment in compaction equipment that improves productivity may result in significant cost savings per cubic yard of compaction. In the long run, high energy impact rollers may result in a cost savings to the agency because compaction specifications can be met with an optimum number of roller passes.</p><p>Implementation of high energy impact rollers on highway construction projects will likely be driven by new specifications and potential cost savings.<br><h2>Cost Information Summary</h2>No cost guidance is provided for high energy impact rollers. Agencies should consult with experienced grading contractors and equipment suppliers to evaluate the feasibility of implementing high energy impact rollers.<br><h2>Conceptual Cost Estimating Tool</h2>No cost estimating tool is provided for this technology.</p></p>