The underpass is built within part of the former <a href="https://en.wikipedia.org/wiki/Kingsway_tramway_subway" class="extiw" title="en:Kingsway tramway subway">Kingsway tramway subway</a>, which was 20 ft (6.6 m) wide and allowed bi-directional flow because of the fixed rails and relatively narrow width of the trams. The new underpass was built by <a href="https://en.wikipedia.org/wiki/Mowlem" class="extiw" title="en:Mowlem">John Mowlem &amp; Co</a> and opened on 21 January 1964.
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