Automate the headlights so drivers can't forget to turn them on in low visibility.

My philosophy is: Everybody needs to look out for everybody else.

I think that maps showing platform details would be useful to visitors, especially to chaperones of school groups, etc. Also useful would be either a compass rose or an arrow pointing North at every metro exit. Emerging from underground is disorienting, especially at night.

It would be helpful to be able to see the layout and for the maps to label what exits to use to get to nearby sites/buildings so you aren't wandering the station trying to read the signs in the crowds.

Nobody likes paying tolls. It's difficult to explain the concept of dynamic tolling, where the price varies to maintain the flow of traffic. And it's difficult to explain why highway widenings don't wind up helping commuters in the long run.

Seems like people could behave themselves without making a calculation regarding how likely or unlikely they are to kill other people.

Metro, built in the late 20th century, is the most escalator-dependent system in the world.