Ismael El-Amin was driving his daughter to school when a chance encounter gave him an idea for a new way to carpool.

On the way across Chicago, El-Amin’s daughter spotted a classmate riding with her own dad as they drove to their selective public school on the city’s North Side. For 40 minutes, they rode along the same congested highway.

“They’re waving to each other in the back. I’m looking at the dad. The dad’s looking at me. And I was like,........

© Fast Company