This drone video by Tim Engstrand shows the magnitude of the Jefferson Parkway Toll Road as it cuts through Leyden Rock. Notice the proximity to the homes backing to the parkway. The large imprint at the east end of the Parkway is the base of the overpass over Leyden Rock Drive.
As we do our research, we have been compiling maps of the Jefferson Parkway toll road through the years. As you download the maps, make sure to reference the date. It is quite intriguing to see all the changes since the beginning of the toll road to the present.