Southwick tunnel night closures

[Don Tmatter]

There never seems to be any sign of fresh work done after the closure though.

 

[Dick Head]

I've just come back for a visit to good old Sussex after quite a while away, and I see the regular tunnel night closures still seem to be in operation. No other tunnel - Dartford, Blackwall, Mersey, Hatfield, Tyne etc - seem to have anything like such frequent inconvenient closures. Does anyone know what the hell the reason for them is? The info signs have never offered any explanation.