South East England MEP Antony Hook crowdfunded for the 150 square metre banner in less than 24 hours.
The contraflow system was created in March 2019, at a cost of £35m to prevent delays on the motorway in the event of a no-deal Brexit.
The Conservatives are celebrating after holding on to the majority of their seats across the Thames Valley, South and South East of England.
Liberal Democrat Stephen Lloyd has been defeated by Conservative Caroline Ansell who wins the seat for Eastbourne.
Rosie Duffield has been re-elected as the Labour MP for Canterbury despite the exit poll predicting she would lose.
General Election results for the South East.
General Election results for the South.
General Election results for the Thames Valley.
In the Meridian region the exit poll suggests the Conservatives could hold onto all the seats they feared were in danger.
Southampton Itchen is one of the most important contests in the 2019 General Election.