The Artery's many on- and off-ramps, clearly visible in this photo, would contribute to its downfall.
This 1956 photo explained that the No. 1 lanes were for passing, the No. 2 lanes were for travel, and the No. 3 lanes were for entering and leaving the roadway. The constant exiting and entering of cars slowed traffic on the entire highway.
The underground Artery has just two downtown exit ramps.