no-light roads

I live in a city with an unholy number of traffic intersections and lights. When traffif flows it is OK, but when there are too many cars you can easily find yourself spending 1 minute each at 10 lights when only traveling 2 miles.

Instead, have north-south roads at one level and east-west roads at a higher or lower elevation. Each intersection would be an overpass/underpass with transition roads for right turns only.

Rather than build the N-S roads all at a consistently high level with expensive concrete and steel, you could make each road segment gently graded up or down so that N-S roads reach their highest point just where a E-W road reaches its lowest point at an intersection. I.e., every 1/2 mile or so.

With no left turns, one would sometimes have to drive around the block, but it would all go much much faster since there would be no stopping, only merging. Fuel would be saved as well.