It’s not “sexy (Ed. note, stop calling cars sexy),” it’s not “rad,” it’s not loud, and it doesn’t add more power, but the humble seat belt might be the greatest automotive invention of all time.

People had money. And they wanted to spend it. But Jarret Schlaff and his team at Pingree Detroit didn't have any dog leashes to sell. Still, they wanted to explore the idea. The company on Livernois ...