Here's a new one! Covered bridges. The old historic wooden ones.
Some of you may never see one in your life, but if you do encounter one be aware that some have 2 parallel wooden runners meant for car tires. Between them and on either side is the "floor" of the bridge, which may or may not be in good repair. It may also be a good 4-6 inches lower than the runners. So as you enter this dark tunnel on a bright sunshiny day you may find yourself suddenly lower than you expected to be with visions of dropping through to the stream below. Then you may find yourself waiting at the end of this dark tunnel for a passing motorist to help you lift your bike back up to the road surface... Or to run you over as they can't see coming in either.
