A sinkhole by the walkway. A pothole the size of a parking space. Here's how we fixed both at Carrington Middle School — without shutting down the lot.

Water, weather, and heavy traffic can turn a small crack into a full pothole fast — here's what's really happening under the surface of your driveway or parking lot, and how to stop it before it starts.

A sinkhole by the walkway. Potholes in the carpool lane. Here's how we fixed both at Merrick Moore Elementary (without tearing up the whole parking lot).