JR East, the East Japan Railway Company, wants Tokyo commuters to stand on both sides of station escalators instead of reserving one side for impatient people who want to walk. A study found that most escalator accidents happen when walkers stumble over luggage or run and slip, so the all-standing policy is safer and more efficient.
Good luck with that. The policy was tried in Hong Kong, London’s underground and DC’s Metro, but it didn’t go over well. Standing to one side on escalators and walking on the other is too firmly embedded in urban behavior. In Washington, there’s even a song about it: