In order to reduce the nation's production of Greenhouse gases and energy as well as reduce automotive congestion without widening roads, Shenzhen Huashi Future Parking Equipment in China has developed a 4-meter high "Straddling Bus." It is essentially a bus on a track that can drive over any automobile 2-meters high or shorter.
I'm still not certain how the bus will cope with turns in the road or tall vehicles, or how automobiles will deal with lane changes, but I have to say that this is almost as smart as cars with stilts, springs, or raccoon buses.
More information on the straddling bus can be obtained here or here.
