Currently, the average time needed to get through the customs check at Dover or the Eurotunnel
is two minutes. According to calculations by Imperial College London
, this can lead to queues on the A20/M20 of 9.7 miles during peak times. Under a post-Brexit situation, especially in the event of 'no deal', these times could increase significantly. As our chart shows, this could lead to queues of 19.8 miles for a 3 minute check, growing to an estimated 39.6 miles if these checks take 4 minutes.