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Tire traction test data has shown empirically that peak skid number dry pavement traction performance of bias ply tires is inversely proportional to the dynamic instantaneous tire load and is a function of inflation pressure. A modification to classical braking theory, which assumes constant traction coefficients at the tire-road interface, is therefore required to obtain maximum theoretical unlocked wheel vehicle deceleration. Optimum brake proportioning between front and rear axles is dictated by the maximum braking force which, with respect to each axle, can be generated at the tire-road interface. The inclusion of peak traction coefficient normal load sensitivity significantly modifies classical theory and changes the selection of brake force balance required to attain maximum theoretical deceleration capability. The importance of the effects of tire traction load sensitivity on the requirements of FMVSS 105-75 is discussed in this paper.

A new method, which enlists the aid of a digital computer, has been perfected to quickly and accurately determine the performance of a proposed rearview mirror while still early in the design stage. Because of the Federal Motor Vehicle Safety Standards (FMVSS) require a minimum viewing performance for both inside and outside left rearview mirrors, and since a common method — by which an intended design can be judged for compliance — would benefit both the Industry and the Federal Government, this method and the appropriate computer programs are being made available to all interested groups. Use of the computer programs results in a tremendous time savings over any manual drafting technique. This paper is intended to serve as a design guide to be followed when packaging rearview mirrors. A general introduction on the subject of rear viewing is followed by a discussion of the approach to the problem of evaluating the performance of a rear viewing device.