Motorways were shut and rail travel suspended in partsCredit: Chris Gorman / Big Ladder
The M23 was closed in both directions and landslides blocked Southern train lines sparking "do not travel" warnings on Friday.
Cars trying to get to the airport are sat bumper-to-bumper in long queues as a large chunk of the motorway is expected to be closed for "several hours" this morning.
One driver tweeted: "3 hours so far on the M23 northbound and queuing to get off at Pease Pottage. Keep well away."
More than 31 million Brits are expected to hit the roads this weekend to try to beat bumper-to-bumper Christmas traffic.
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Passengers face train chaos in Kent, Surrey and Sussex as delays and cancellations have been warned.
Aerial snaps show large stretches of murky floodwater.
Cars can be seen zooming across waterlogged roads as floodwaters creep up trees, dwarfing them.
Drivers have had to battle with the flood water all over the south of the countryCredit: JIM BENNETT
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The Environment Agency has warned there will be more floodingCredit: Splash News
Rail journeys have been severely disrupted by floodingCredit: SWNS:South West News Service
Cars plow through floodwater in Kent this morning after an overnight delugeCredit: JIM BENNETT
Water is gushing onto the M23 after heaving rains caused floodingCredit: Highways England/Twitter
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Cars on the great Christmas getaway are bumper to bumper on the M23
The Met Office warned of localised flooding and urged people to take care when travelling.
Southern Rail said: “The Balcombe area is currently flooded. Due to the consistent rainfall, the water level has reached rail level height, this means trains are not able to to travel over the track.
“Network Rail have dispatched track maintenance teams to the area, to assess and take whatever action may help.
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“We strongly advise to not travel at this time.
Work is ongoing to clear the M23 of floodwater this morningCredit: EDDIE MITCHELL 07771605974
Large sections of the main road are closed due to floodingCredit: Highways England/Twitter
Strong winds also pulled down trees and blocked roads - as millions of Brits prepare to travel ahead of Christmas
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Flooding has severely disrupted drivers on the M23 after heavy rainfall
Heavy rain has caused floods and landslides disrupting the Southern rail route between Brighton and Gatwick
Traffic builds on the M25 in Sussex as flooding causes chaosCredit: Chris Eades
Flooding in the Balcombe area has seen chaos hit train lines - affecting people travelling to Gatwick
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Fifty homes had to be evacuated in the seaside town of Hayle in West Cornwall due to flash floods yesterdayCredit: SWNS:South West News Service
UK weekend weather forecast for your Christmas drive home
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