BART’s Transbay tube between San Francisco and Oakland is closing for repairs on both August 1-2 and 5-7. It’s going to be a hassle getting across the during those times, no doubt. What’s more it’s an issue we could have avoided nearly 80 years ago. If only the the city had taken inventor Cleve F. Shaffer’s idea seriously back in 1937. His proposal was equally elegant and convenient: a subterranean moving sidewalk that could have shuffled riders beneath Market Street in comfort. Then again, given how often BART’s downtown escalators breakdown on account of the truly monumental amounts of bum poop that get caught in them, keeping a moving sidewalk the length of Market Street would be nearly impossible. Find out more about this incredible invention at SFGate.