The objective of this research was to design and test devices for addition to log trucks that removed mud from the dual-tires before the trucks entered the public road. The four devices built were simple, inexpensive, and could be built by a logging or trucking contractor. The "bar and scraper" and "mud flap" removed 85% and 84% of the mud, respectively, that adhered to the dual-tires during the test. The "bar" and "rope" removed 78% and 40% of the mud, respectively. / Master of Science