Tunnels Revisited

Every year,my family heads into the Rocky Mountains for a Spring Break trip in Breckenridge, Colorado. With sledding and hot-tubbing on the agenda, the kids are more than excited. The two-hour drivetakes us up winding canyons, beside rippling creeks, and through seven tunnels. (The whole car counts them thanks to my daughter’s autistic characteristics.)

Some tunnels were quite short. One stretches for over a mile and a half and crosses the Continental Divide at over 11,000 feet elevation. All...