Potholes in the road are a huge problem. The economics of mending them mean however that the potholes that get fixed are the largest most destructive ones. Large potholes almost always start life as small holes or fissures in the road that gradually grow.
Brilliant Idea #122 is a robotic machine that identifies small holes and cracks, drills the hole, sucks out and loose material and fills the hole with liquid asphalt, therefore repairing it before the pothole grows and becomes dangerous.
Potbot could work independently, and if not, with a one man operator, and is designed to work at night so as to minimise disruption to the locality.