In the past few months, we have covered a bunch of wall climbing robots here. MIT researchers have come up with a system of quadcopters that are also capable of move on the ground and also fly. Such an approach enables drones to fly over ground obstacles and drive underneath overhead obstacles:
Adding the driving component to the drone slightly reduced its battery life, meaning that the maximum distance it could fly decreased 14 percent to about 300 feet. But since driving is still much more efficient than flying, the gain in efficiency from driving more than offsets the relatively small loss in efficiency in flying due to the extra weight.
By testing autonomous drones and robots that can move in the air and on the ground without a collision, researchers aim to learn more about ways to make flying cars of the future safer for everyone. More info is available here.