It is tragic that people are choosing to jump off the bridge, but I don't see how the ban is going to save desperate people in the future. What if they drive halfway across then just stop their car and get out before anybody can stop them?
Alternatively, they go to a different bridge instead? This bridge over the A63 at Hessle is only 300 metres from the Humber Bridge.
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Even if you had security guards preventing access to the Humber Bridge, people could be at this one within 5 or 10 minutes.