Putting Research into Practice: Improving Subgrade Test Rolling Status: CompleteReport Date: 06/27/2011 Summary: Researchers developed a new test rolling system and an associated construction test specification that MnDOT can use to approve compacted subgrades on construction projects. This system can be used on a wider variety of subgrade types and depths, and is safer than the previous system, allowing for a more flexible testing program overall. Final Deliverables: Report #2011-15 Technical Summary Related Materials: Related Research: