Falling ice causes closure of the 2nd Severn bridg - henry k
Falling ice causes closure of the second Severn bridge
news.bbc.co.uk/1/hi/wales/south_east/8426267.stm

Falling ice causes closure of the 2nd Severn bridg - Altea Ego
Happened last winter too after large sheets of ice crashed on the carriageway.
Falling ice causes closure of the 2nd Severn bridg - Armitage Shanks {p}
Yes it is that or "cylinders" of ice falling off the suspension cables. Whatever it is you wouldn't want to be hit by it!
Falling ice causes closure of the 2nd Severn bridg - Brentus
No you certainly wouldnt want to be hit by a lump. It did happen last year. Never heard it happening on any of the other big bridges, Humber,Forth etc.