as morphio said above
the beach at Berrow,Brean and Weston has a gradient that changes and in parts is almost flat and combined with the rule of 12ths means that at times the tide moves at quite a pace . The prevailing onshore wind can increase this rate. Fortunately sandbars and channels do not form due to the underlying mud and clay.
As the count stated although there are many signs every year people try to walk to the sea and get stuck in the mud and several people drive their cars into the mud, this has been mostly stopped at WSM as the cars are contained further up the beach.