Editing Queensway Tunnel (section)

===Ventilation===
As a roadway the tunnel requires ventilation to clear vehicle exhaust fumes. As originally designed the tunnel would have used forced air for ventilation; fumes and noxious gases were simply to be expelled through the tunnel exits. However, in an incident in the [[Liberty Tunnel]] in [[Pittsburgh]] in May 1924, inadequate ventilation led to a number of drivers being overcome by [[carbon monoxide poisoning]], though there were no fatalities; this led the Queensway engineers to re-examine the issue and to conduct experiments in a completed section under Hamilton Square. Extractors were installed in the planned ventilation stations, adding to their size and complexity, and also adding considerably to the budget.<ref>Ian Jackson, Simon Pepper, Peter Richmond  ''Herbert Rowse'', p46 (2019) Historic England {{ISBN|978-1-84802-549-3}}</ref>

The tunnel currently has six ventilation shafts, three on each side of the river.
On the Wirral side the main shaft is at Woodside, with another (before the main exit) in Sidney Street, while the Dock Exit branch is served by the tower in Taylor Street.
On the Liverpool side the main shaft is at the Pier head, in the [[George's Dock Building]], with another (before the main exit) in North John Street, and the Strand Exit branch is served by the tower in Fazakerley Street. The Georges Dock Building also houses offices of the Tunnels Authority and of the Tunnels Police Force.
All the ventilation buildings were designed by Herbert Rowse, chief architect for the Queensway tunnel exteriors, and all are [[Grade II]] [[listed building|listed]].
<gallery>
File:Queensway Tunnel ventilator, Taylor Street 4.jpg|Taylor Street ventilator, Wirral
File:Queensway Tunnel ventilator, Sidney Street 1.jpg|Sidney Street ventilator, Wirral
File:Birkenhead Tower seen from Liverpool - panoramio.jpg|Woodside main ventilator, Wirral
File:George's Dock Ventilation and Control Station 2018-1.jpg|Georges Dock main ventilator, Liverpool
File:Ventilation Station, North John Street.jpg|North John Street ventilator, Liverpool
File:Queensway Tunnel ventilator, Fazakerley Street.jpg|Fazakerley Street ventilator, Liverpool
</gallery>

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