The perimeter road and the A23 leading to the West Sussex airport have also
been closed and cordoned off since the vehicle was discovered at 2100 BST on
Police have warned there will be severe congestion on both roads, and are
urging people to stay away from the airport unless absolutely necessary.
Passengers are also being asked to check with the airport for flight details
before beginning their journeys.
As the south terminal - one of two at the airport - runs parallel to the
airport's railway station, major disruption is also expected to rail
services passing through Gatwick.
No one at Gatwick airport was available to confirm whether any flights were
arriving or departing from the south terminal.