Every year, billions of vehicles worldwide shed an estimated 6 million tons of tire fragments. These tiny flakes of plastic, generated by the wear and tear of normal driving, eventually accumulate in the soil, in rivers and lakes, and even in our food. Researchers in South China recently found tire-derived chemicals in most human urine samples.
I somehow doubt they would have less particles from friction. They usually use a cushion which touches the ground.
The imagination of a busy intersection with common people driving hovercrafts is funny, though. Or imagine driving on slopes.