Why it matters: Bridge and tunnel: side wind, the bridge light, and the tunnel emergency procedures

A sudden gust on a high bridge like the Zeelandbrug can push a light car sideways by tens of centimetres — exactly enough to hit a neighbouring lane. In a tunnel there is no verge to swerve onto and no room for a U-turn; someone who reverses against a queue or crosses there risks being hit by traffic that does not see them coming. The sequence 'along the wall, in the direction of traffic, never crossing' does not exist as a bureaucratic rule but because it is literally the only route on which you stay visible to the traffic behind you.