Beachgoers are facing up to four hours of traffic to access one of the county's best sunbathing spots.
Rother Police said Camber Sands, near Rye, is attracting over 20,000 visitors a day, with thousands flocking to the sandy beach over the course of the summer.
This has led to huge congestion in the area, with some people sitting in hot cars for almost four hours at a time.
READ MORE: Sussex beach dubbed 'tranquil gem' with 'pristine sands'
Police are now urging people to consider visiting other beaches in the area.
A spokesman for Rother Police said: "With the warmer weather, you may choose Camber beach as the beach to visit this summer.
"Camber is very popular and often has over 20,000 visitors a day with limited car parking spaces and amenities.
"On these days the roads leading into Camber become congested very quickly with up to a four-hour wait in traffic, which means you’re more likely to be sitting in a hot car than on a hot beach.
"So, to avoid disappointment please choose to visit one of our other lovely beaches along the East Sussex coastline."
People who are still visiting Camber are being urged to take plenty of water in case they are stuck in traffic.
Beachgoers are also being advised to plan ahead and download the free Beach Check UK app so they can view congested areas and avoid getting stuck in traffic.
A spokesman for the police force also reminded visitors: "Please take your rubbish home with you when out visiting our beautiful beaches and green spaces.
"If you’re in trouble in the water, remember #FloatToLive. Lean back and use your arms and legs to help you float (like a starfish)."
The beach is so popular as it is one of the few sand dune beaches in the county alongside West Wittering.
Although it is not always easily accessible, it has a number of positive TripAdvisor reviews from satisfied visitors.
This includes one visitor who said the sandy beach was like "paradise".
They said: "Paradise in Camber Sands.
"Camber Sands and all the close-by beaches were excellent.
"Our dog was in paradise and so were we despite the bracing but refreshing British weather."
Another visitor said: " Amazing beach. Clean, looked after and incredible in the sunshine. One not to be missed."
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