This is a robot that would roam the streets at night, and do small repairs to streets and avenues. I'm not proposing that the robot completely replaces the asphalt. All I'm saying is to patch those cracks that show up after a heavy rain, before they turn into real issues. During the day, when streets are used, the robot would go to sleep in a shed and recharge its batteries. 

Some thought would be necessary into making the robot smart enough not to be rammed while working. Theft is also a potential liability.