The selection of a heavy service tire for highway type vehicles requires careful consideration by the vehicle manufacturer. All the improvements that have been made in heavy service tires since 1923 are still with us, but it must also be noted that a few items that were not with us five years ago, such as FMVSS - 105 and FMVSS - 119 through FMVSS - 121 requirements have been added. In view of the impending noise level requirements for highway type vehicles, much work has been done by vehicle manufacturers to depress the various sounds emitted by their respective vehicles.
