The study addressed the braking performance of heavy-duty trucks operating on ice with and without chains installed at various axle positions. The research method included full-scale vehicle tests, measurements of the traction properties of truck tires with and without chains, and computerized analysis of vehicle braking performance. Friction utilization diagrams are appended, showing the axle-by-axle friction demands associated with braking on ice with various configurations of brake systems. The results also include a rare set of data showing the traction properties of truck tires operating under differing ice conditions with two varieties of chains installed. Primarily, the study was intended to determine whether the use of front brakes might degrade braking performance when stopping on ice with chains installed at the rear wheels of a truck or tractor. Existing data showing example brake system properties for U.S. vehicles were used in order to project "typical" and "extreme" levels of front-biased distribution of brake forces. The results show that few vehicles will have the level of front-bias needed for front-wheel lockup to constitute the performance limit on ice.