In 1932 , the Tooth Rock Tunnel was opened .
Some traffic was rerouted to the new alignment , though Mitchell Point Tunnel remained open to vehicle traffic until the early 1950s , when the road was rerouted to the base of Mitchell Point .
In 1932 , the Tooth Rock Tunnel was opened , and some traffic was rerouted to the new alignment , though Mitchell Point Tunnel remained open to vehicle traffic until the early 1950s , when the road was rerouted to the base of Mitchell Point .