literally and figuratively cool !

there are two tunnels on that trail - one around 3350 ft (.67 mile ?) and the other is around 2870 ft (.55 mile ?) not lit and have a curve - so decent light required

on the hotter days when the tunnels are much cooler the fog / dampness will be enough to cause the rotors to get wet and squeal when brakes are applied

will need to check temp outside and inside of the tunnels to determine the difference

a door was installed on one tunnel to limit damage from ice forming during winter months - this was also done to another tunnel on a nearby trail (National Tunnel / Montour trail - see pics below) … the Big Savage tunnel on the GAP is actually closed during the winter months to limit damage from ice - it will reopen in late March I believe





temps can also vary significantly in some areas near ravines and through rock cuts - passing by / through will feel like a burst of air conditioning … one area trail (Redbank Valley trail) actually has large thermometers to display the temperature difference when passing through a limestone cut (pics below)