dr. benjamin battin, a professor at swarthmore college, pennsylvania, had a similar plan for an eight-story high boulevard. the street level and first floor would be connected to the hudson river piers. the second and third stories would carry electric passenger trains, with the second floor carrying northbound traffic and southbound traffic using the third floor. a public garage would occupy the fourth and fifth floors, helping to pay off the bonds for the project. the sixth and seventh floors would carry one-way passenger car traffic, permitting speeds of up to . a reversible roadway, carrying cars in the direction of rush hour traffic, would occupy the eighth and ninth (top) levels. ramps to the upper car levels would be provided every 15-20 blocks.