the streets have pedestrian crossings marked by red hands and white men. These are arranged so that when you cross at a white man, the next junction you arrive at will invariably be a red hand.
Here's what the difference is between the two.
A red hand means that if you step off the pavement ("sidewalk", colloquially), you have to make a saving throw versus traffic or take a massive reduction to your hit points.
A white man means exactly the same, except that you can't be sued by the owner of any vehicle that strikes you for whatever damage you may cause to it.