An interesting idea, but when I saw the tiny wheels I lost interest. The reason why skaters don't use their boards and Rollerblades for general transportation (and why Neal Stephenson had to invent SmartWheels for his skater couriers in Snow Crash) is that those tiny wheels amplify the impact of potholes, cracks, and road debris: it makes the likelihood of an accident much higher, and the consequences much worse, at higher speeds, and the whole point of a motorized vehicle is to go faster. (The cited 12.5 MPH limit is highly questionable; maybe on perfectly flat roads. A decent bicycle could easily pass him. For that matter, I find it interesting that the photos show perfect "black ice" pavement.) It's why you don't see Vespa-type scooters on the highway, even though they're legally motorcycles.