The Thames Gateway Airport was an airport proposal from the 2010s. Several variants of an airport on the Hoo Peninsular, or the Isle of Grain, or on an artificial island in the Thames Estuary have been proposed. However, the Airports Commission, shortlisted an Isle of Grain-based Airport in 2014 as a possible site for expanded air capacity.
Most of the access would be by rail, however quite sizeable road improvements would be needed, not least the D4Mmotorway accessing the site and dualling of the A228 from Strood.
On opening in 2030 the following bits of road would have needed to have been widened due to Airport traffic (presuming no Lower Thames Crossing, which would alter widening in Essex)