Ha! I was on I-64 driving through East St. Louis IL and exited at Kingshighway where the strip clubs are located. Luckily found the most beat up BP Station near the highway with lots of folks hanging out. Was taking flowers over to our mom's grave so maybe she was watching out....Much better than "sir, you need a new engine"...some dealerships would jump right to that.
That was likely sudden coolant loss. Unless the spot is life threatening, you want to stop right away. Probably a good thing you didn't have any coolant in the trunk. You want to wait a bit before adding cool coolant to a hot engine as it can crack the engine block.