Covid-19 lockdown has helped stop lorry chaos at Dover after Brexit | Updated: 20:40, 04 February 2021 The coronavirus lockdown has so far helped stop the feared roads havoc after Brexit - but a police chief has warned it might still happen. Traffic gridlock was predicted on routes towards the Port of Dover and Channel Tunnel after the UK left the EU. A snaking queue of trucks outside Dover. December 19. Picture: Sam Lennon But routes to the Channel Ports have not so far clogged up despite fears that they could after the end of the transition period. However, both police and hauliers say it could eventually happen once traffic levels return to normal.