Dennis Callan - 
Street level rail is useless simply because it "will be controlled by existing traffic lights".
Know ye all hat there are things today that speed up traffic beyond anything imaginable in the 20th century.
Yes.  
(1) No more stopping at street intersections for left-turning cars.  Cars make a left turn without stopping traffic flow.  10 intersections saves 10 minutes in travel time!!
(2) Controlled traffic flow that allows cars to go thru 10 intersections without stopping. (No. Synchronized traffic lights is obsolete 20th century technology)