Seriously though, in the downtown portion of Houston there are only two directions people want to go in a hurry, northeast and southwest. Those roads have at least double the carrying capacity of the cross-roads and as such it absolutely makes sense to optimize the lights for them.

So what happens is that the "get me out of downtown" roads are very well timed and the cross-streets aren't but that's OK. Most people don't need the cross-streets and if they do, they're fairly lightly traveled because most people don't need them.