Imperial College London

Dr Ke Han

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Senior Lecturer



+44 (0)20 7594 5682k.han Website CV




Mrs Maya Mistry +44 (0)20 7594 6100




605Skempton BuildingSouth Kensington Campus






BibTex format

author = {Han, K and Graham, D and Ochieng, W},
booktitle = {M20/A20 Congestion Prediction with Post-Brexit Border Delays},
title = {M20/A20 Congestion Prediction with Post-Brexit Border Delays},
url = {},
year = {2018}

RIS format (EndNote, RefMan)

AB - This research was commissioned by the BBC Inside Out South East program. It aims to quantify the congestion impact on M20/A20 of potential check time increase at Port of Dover and Eurotunnel (in Folkestone) in a post-Brexit scenario. We focus on a 40-mile segment of the M20/A20 motorway between Maidstone and Dover, with local access to Ashford and Folkestone. We consider outbound lorries and passenger vehicles that use the ferry and tunnel to cross the Straight of Dover, as well as traffic with local origins and destinations. Traffic simulations were conducted with assumptions regarding the check times at Dover and Eurotunnel for both current and post-Brexit scenarios. The impact of vehicle queuing at these locations was assessed in terms of queue length, travel time, and disruption to local traffic. The findings show that even one or two minutes of extra check times at the borders are accompanied by a dramatic increase of congestion on the motorways as well as local streets, with queues extending up to 30 miles from Dover/Eurotunnel towards Maidstone and travel time approaching 5 hours in peak times.
AU - Han,K
AU - Graham,D
AU - Ochieng,W
PY - 2018///
TI - M20/A20 Congestion Prediction with Post-Brexit Border Delays
T1 - M20/A20 Congestion Prediction with Post-Brexit Border Delays
UR -
ER -