Currently the State of Maine is investigating the use of scrap rubber tire chips as a fill layer beneath both paved and unsurfaced roads. As part of this investigation an unsurfaced road test site was constructed in the town of Richmond in August 1992. The investigation included five construction designs incorporating scrap tire rubber layers. Two control sections consist of an existing unmodified road and a reconstructed section without scrap tire rubber. This paper discusses the objectives of the test, the development of a test plan, the results of analysis, and conclusions and reocmmendations.