The early motivation for this work came from reports of oscillatory vehicular instabilities from motorcycle racers, as well as reports from a respected motorcycle manufacturer. The racers were having difficulty setting up their machines so that they would not be troubled by either wobble or weave. Fixing one appeared to undermine the other. Manufacturing reports indicated that these problems have a significant non-steady- state speed dimension; under some circumstances their racing machines would oscillate under acceleration. These difficulties have been addressed in earlier...