The Plan: Park on Bow St. Then 6 15 mile loops Concord-Carlisle-Bedford with side trips to National Park to poop and DD for some food and Coke. It turns out the Carlisle traffic circle was still under construction so 2nd and following loops went directly onto Church St - past the elementary school. That cut off maybe 1/4 mile or so. But it did have a screaming downhill. Went to DD after lap 1 and 3. There were house painters parked in my spot on Bow St, so I merged in with them. Heart Rate worked well - wetted it at the start and then sweat the rest of the time. Cadence was pretty consistent - several good downhills for coasting each lap. No fade in speed in the later laps. The phone worked well, except it ran out of battery at mile 97.5 - but NO SIGN of the Straight Line dilemma. I will 0 out the mileage and time for phone. Concord Public Works - road cap bad at Library where Stow St comes in.