We have many bridges and tunnels in the greater Norfolk area. Its a bit like Boston would have looked like if no one had filled in all that inconvenient water in down town.
This causes no end of traffic problems (as any choke point will), but its made much worse by accidents _in_ the tunnels, or on the narrow parts of the bridges. My commute (very deliberately) does not even get on the highway, but the morning traffic always has at least one tunnel closed, or two tunnels down to one lane for accidents.
To quote Clarkson: "How hard can it be?'
You keep the car off the walls of the tunnel, that's the grey/brown stuff just over the white line, keeping the water out, and you in, for those in the back of the class.
Don't drive faster then the car in front of you, or slower then the car behind you. For those in the back: that's all the other boxy things on the road with you. If those two contradict each other match the speed of the car in front. The guy behind you will follow suit (and if he doesn't hopefully the damage to your car won't include anything too important).
It is no harder to drive in a tunnel then on the open free way, think of it as a freeway with a roof.
Either there is a respawn point for 'clueless fools' just before the tunnel, or they pump stupid gas into them, because I have a hard time believing that this rate of accidents is sustainable in the long term (although I'm told by my coworkers that it is).
I'm just dreading the day we move into a house, and have to deal with one of the above tunnels or bridges.
P.S. While scheduling draw bridge openings and announcing it on the radio is a great idea, who the hell thinks that opening a drawbridge at 08h00 is a good idea? Are they _trying_ to screw up the morning commute?