Things They Should Invent: signs indicating which crosswalk has the longer light

At intersections with an advance green, one of the crosswalk has a longer green light than the other. It would be helpful to know this, especially if your ultimate goal is to cross kitty-corner and especially if the other street is easily jaywalkable. There should be signage to this effect. Yes, sometimes you can extrapolate from the advance green signs, but the advance greens don't always have signs.