That specific design is not road worthy. Ideally you would want to be able to fold the top blades and add a duct for the pusher but that's not to bad. However, you can see the design is structurally fairly close to a car. Many designs have powered wheels simply for added maneuverability. Safety in a collision is going to be an issue due to weight concerns, but they can easily be safer than motorcycles which many people drive.
Advantages, unlike quad-copters loss of electronics or engine power at altitude does not equal death. They can do unpowered landings far more easily and safely than helicopters. Unlike fixed wing aircraft they can do vertical take offs and landings. Also there constuction and maintenance costs are well below that of a helicopter.
Downsides they can't hover, they have slightly lower top speeds than small airplanes, and unlike quad-copters they have a fairly large wingspan on takeoff. However, quad-copters are the only aircraft with this feature and there incredibly unsafe.
http://en.wikipedia.org/wiki/Autogyro
Advantages, unlike quad-copters loss of electronics or engine power at altitude does not equal death. They can do unpowered landings far more easily and safely than helicopters. Unlike fixed wing aircraft they can do vertical take offs and landings. Also there constuction and maintenance costs are well below that of a helicopter.
Downsides they can't hover, they have slightly lower top speeds than small airplanes, and unlike quad-copters they have a fairly large wingspan on takeoff. However, quad-copters are the only aircraft with this feature and there incredibly unsafe.
EX: A 4 seat 130mph cruse version is just a little to big for the highway. http://en.wikipedia.org/wiki/Groen_Hawk_4