I agree, falling in a car off a bridge into water has always seemed, to me, a fearful way to die. Not far from here, the Öresund bridge over to Copenhagen - one of the longest cable-stayed bridges in the world - was inaugurated in 2000, serving both jampacked commuter trains, big delivery trucks and cars. Denmark has had a small number of troops in Iraq - they're just winding that down - and is not a popular country in the Arab world (the Muhammed cartoons affair last year etc).
You bet it's crossed my mind sometimes: what would happen if that bridge were the target of a successful terrorist attack?