The vehicles, including Lamborghinis, Audi R8s, a Ferrari, and a Porsche, were taken by police after members of the public reported a convoy travelling northbound on the M11 from London at around 4.20pm. Witnesses claimed the drivers were accelerating at excessive speeds, braking heavily, bunching together, and using the hard shoulder to undertake other vehicles. 13 supercars were seized (Image: Essex Police)13 supercars were seized (Image: Essex Police)Essex Police traced the convoy to the services at Junction 8, where they seized all 13 vehicles and issued anti-social driving warnings. 13 supercars were seized (Image: Essex Police)A number of offences have been identified and are under investigation. Anyone who saw the vehicles or has relevant recordings is asked to contact Essex Police, quoting incident 955 of 28 July.