A literature search was conducted to determine the state of the art for signing applicable to surface mine haulage roads, along with a survey of existing Mine Safety and Health Administration (MSHA) regulations and a review of MSHA accident records. Nine mines were visited to gather information on current signing practices. Preliminary signing guidelines were then developed based on the data. Field demonstrations of the preliminary signing guidelines were conducted in which signing programs were implemented in two mines. Signing requirements were first assessed at each of the two participating mines, and the necessary signs were designed, purchased, and installed. Evaluation of the signing program as to its adequacy, appropriateness, and effectiveness was solicited from mine management and operations personnel. Experiences gained from field evaluations were then incorporated into the final signing guidelines and are presented in this report.