Paul Maynard, Parliamentary Under Secretary of State at the Department for Transport (DfT), has announced the deadline for the decision on the development consent order is to be extended to 10 May 2018.
The extension is to enable further consideration of the effect of the scheme on air quality, including its compliance with the updated UK plan for tackling roadside nitrogen dioxide concentrations published by government on 26 July 2017.
Maynard added the decision to set a new deadline is without prejudice to the decision on whether to give development consent.
TfL said the earliest the Silvertown Tunnel could become operational is in 2022/23.
The application will allow for the construction of a new twin bore road tunnel to pass under the River Thames, providing a new connection between the A102 Blackwall Tunnel Southern Approach and the Tidal Basin roundabout junction on the A1020 Lower Lea Crossing, London.
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Last month DfT extended the decision deadline by a month to 10 November.