[3] During this period, the tunnel was used to hold up to 87 of PAT's disused 1950s-era transit buses in reserve.

[5] Despite this, in 1980, vandals gained access and smashed hundreds of windows and headlights on the two rows of buses parked inside.

[4][6] As part of the conversion to a roadway, the guideways for the Skybus system were removed and replaced with new paving and drainage.

[citation needed] On November 6, 2013 the Federal Transit Administration lifted the car pool requirements to provide an alternate route for drivers, due to the two-year closure of outbound West Carson Street.

[4] The county intended to convert it to a road and use it to relieve the traffic congestion in the Liberty Tunnels, and in 1933 commissioned a $5000 study to investigate this concept.

[4] As of April 2006[update], the tunnel was operated and maintained for PAT by Bruce & Merrilees, at an annual cost of $780,000.