Did a 16 mile loop around Hanscom AFB and back. Usually, we do it in the other direction, but because it was rush hour, we reversed it, so we would have less time on the road with cars heading home from the city. So, except for my street and driveway ( ) it was a flat ride. I pretty much never have the chance to ride anything flat, so it was nice.The only weird thing was that when we left it was partly sunny, and after about 3 miles, the sky got really cloudy and dark. I mean so dark, I could barely see with my dark lenses on. It looked really threatening to rain or even thunder, but it didn't. As soon as I got home, the sun came out.