This morning I travelled out at 4 plus and discovered what was causing the jam at the causeway. One lane was taken by trucks - the whole stretch of the causeway. The next lane was occupied by the blue buses - whole stretch of it. So the poor cars only had one lane to move along. Took almost 2 hours to clear.
They really ought to find a separate route for heavy vehicles...there was a morning where one of the lorries was in the second (bus) lane and was trying to move to the lorry lane. In doing so it blocked half of the bridge causing a major jam for everyone else. Grrrr.