[tobtoh]

They don't work - well at least they aren't idiot-proof. See the comment above regarding the Montague Bridge in Melbourne, Australia. They have those height bars installed and we still routinely have trucks being peeled open.

I have no idea how you can be so distracted when driving that you fail to register when your truck is whacked by those height bars, but ... ¯\_(ツ)_/¯

[tetris11]

They're not stupid, they're tired.

They've been driving day in day out on autopilot. Signs begin to blur after a while.

[rusk]

Probably shouldn’t be driving so ...

[throwaway2048]

There is a long list of unhelpful "Probably" statement's that don't solve the problem.

[rusk]

No. Really. Driving while tired is considered to be as bad as driving under the influence. HGV drivers should really be seeing rigorous testing for this but - hurdur - freedom