This looks like a typical 'B' class road with a single carriageway having one lane each way. The width is good with a reasonable amount of room in each lane for large vehicles such as buses.

It would be typical and very ordinary if it wasn't for one small point.

At some times during the year it looks like this!

This road is the only road that serves Mersea Island on the Essex coast. All traffic going onto and off the island must use this road. However at high spring tides this road can be covered by the sea water and the island is cut off for an hour or more.

This picture was taken before the maximum high water level was reached and the vehicle has now passed the deepest point. Vehicles with a high ground clearance can still get through but it's safer to wait if you're unsure.

The maximum depth of water can reach 3 feet.

Whilst the tide is at it's highest the traffic on the island has to wait patiently until the water level drops enough for them to get off.

The white line at the centre of the road can be seen under the water in the bottom right-hand corner.

The bay on the left is actually a lay-by. Not a good place to park when a high spring tide is expected.

Looking along the main causeway from the island at high tide.

Note that there is a small raised section not covered by water where a few cars are waiting. Everywhere else is now flooded.

I am not aware of any other road in Great Britain which experiences conditions like these.

This shows the same view as above but at low tide.

The water is now back in it's more usual channel, which lies just beyond the black and white road signs, and runs left and right of the fences on each side of the road.