Baker-Barry Tunnel — Attraction in Sausalito

This plan calls for a tunnel 2000 feet long and 8,380 feet of new roadway. It would furnish a direct highway between the two forts with no difficult grades and as nearly unexposed to hostile fire as possible. The road would have great value in peaceful times, as it would eliminate the troubles of landing cargoes from vessels at Fort Barry; but its strategic value in time of war would be far greater. There is a road between the two forts now, but it is so poor as to be almost worthless in peaceful times and would be pitifully inadequate if a foe's fleet were outside the harbor. The present road is four and one half miles long, its grades are too steep for heavy hauling and the bluffs around which it twists adds to its perils,...

it's rare to evaluate a tunnel, but this is a pretty interesting and functional tunnel. It's also known as the 5-minute tunnel, because it's a one-way tunnel with a stoplight. Each direction weights for 5 minutes for the other direction to clear. Bikes can go in both directions at the same time. The tunnel itself is not especially exciting, but it's extremely functional. It's essential to access the Marin headlands and beaches such as...

Drove through this tunnel in August 2023. Its one lane. You wait at the entrance for a green light. Perfectly fine. Perhaps at some time in history when cars were narrower it may have been two lanes. No more. An example for other infrequently traveled roads that are currently bi-directional all the time and do...