It was intended to replace the few kilometres motorists had to drive along Epping Road, through the suburb of Lane Cove, between two sections of freeway.

[5] Emergency crews pumped 1000 cubic metres of concrete into the hole to try to stop the housing block from collapsing into it.

[6] An investigation by Workcover NSW found that the collapse was caused by geological conditions at the site, the large span width of the tunnel, and inadequacy of roof support.

[8] Before the opening of the tunnel, motorists had to drive along Epping Road through the suburb of Lane Cove, for the few kilometres between two freeway sections.

Dr Manins also said most of the air quality modelling results were in fact likely to "over estimate emission and pollution levels".

The air quality readings published for particulate matter (PM10) are 24-hour averages, as required by the Planning Minister's Conditions of Approval for the tunnel.

According to a Herald editorial, "The use of public funds to compensate Connector Motorways for delays to road changes around the tunnel is ... as cynical a piece of political jobbery as Sydney has seen in many a long year.

[28] The measures were designed to try to overcome the disconnection of the local community resulting from the extensive road work – reinstating right hand lanes, adding pedestrian crossings and making improvements to public transport infrastructure.

In July 2022, it was revealed there was cracking found in sections of both the east and westbound tunnel roof, with the owner Transurban taking the builders to court for remediation.