In 1954, the SRC decided to construct a tunnel between Canton and Fairfield, with three approach highways: a west approach from US 1 in Elkridge, a south approach from MD 2 in Glen Burnie to connect with the west approach in Brooklyn Park, and a north approach from US 40 and Erdman Avenue in east Baltimore. The approach highways were to be limited-access with directional, partial interchanges so that only traffic intending to use the tunnel would use the approach roads. Any vehicles entering an approach road would not be able to exit until having passed through the tunnel and the tunnel toll facility.