Tunnel ventilation structures have been classified as generally environmentally friendly. Air quality was expected to improve near roads that would be subject to permanent truck curfews, but increased traffic on some roads, including Millers Road and Geelong Road, would have a negative impact on air quality.  [Note 1] EDC`s Social Impact Assessment found that the significant increase in heavy traffic on Miller`s and Williamstown Streets was problematic for local residents. Residents of Millers Road would suffer from decreased safety and equipment and greater difficulty getting to services and facilities south of the West Gate Highway, while on Williamstown Road, this would affect connectivity and travel times and affect the likelihood of cyclists and pedestrians using and crossing the road. Of williamstown Road, the report noted, “This is a significant change for a road that has a high proportion of residential facades and high-density residential areas to the east and west of the road itself.”  In April 2017, the project was renamed the West Gate Tunnel.  When the West Gate Tunnel opens, there will be 24/7 truck bans on local roads in the west-central, which will help improve road safety, local air quality and noise. Transurban said Wednesday that the joint venture claimed to terminate the contract following “issues related to the presence, classification and sale of [PFAS] at the project site.” The Maribyrnong Truck Action Group said the EES had not recognised the serious health effects of diesel particulate matter. It claimed that the SEA contained inaccurate and misleading air quality and modelling, as well as outdated background models, and criticised the lack of an air filtration system for the project tunnel.  MTAG found “alarming” negative impacts on the community resulting from increased heavy vehicle traffic on Williamstown Road, Millers Road, Blackshaws Road and West Gate Highway. He called for a ban on trucks on Williamstown Road, which would see an increase of 1500 trucks per day between Geelong Road and Somerville Road, which would lead to an increase in air pollution. He also called for a ban on trucks on Millers Road north of the highway, where truck traffic would increase by 7,000 trucks a day, as well as on Hudsons Road, Spotswood west of the railway line.  The doubling of the length of the twin tunnels since the publication of the initial plans resulted in a $1.2 billion increase in construction costs compared to $5.5 billion in the original budget of $5.5 billion.
 The proposed route has undergone some changes since the plans were published. The final plan calls for eastbound traffic to leave the West Gate Highway via a tunnel gate near Williamstown Road via the Western Distributor. The vehicles will disembark from the tunnel near Whitehall Street in Yarraville, then climb a new bridge over the Maribyrnong River and the road over Footscray Road, from where they will have access to Swanson Dock in Melbourne Harbour via docklands, CityLink and the CBD. A new connection between the West Gate Highway and Hyde Street – essentially the exit and ramp component of the original West Gate distributor – will allow truck signs with dangerous loads like fuel to directly access the road network to move east or west, rather than using local roads.  Maps show that the incoming exit ramp is connected to Hyde Street north of Stony Creek, while the outbound driveway begins at the intersection of Stephen Street and Simcock Avenue, Spotswood. .