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"It will have all the information it needs to re-route," says Mr Colman.

The idea, they say, is to re-route general traffic around some of the capital's most famous streets like the Grassmarket and parts of the Royal Mile where pedestrians would be given priority.

But ship tracking data shows that this changed from 15 December, when ship operators began taking decisions to re-route their cargo around Africa.

The shipping company Maersk had announced earlier that it had decided to re-route its ships that have been paused for days outside the strait and Red Sea, and send them around Africa instead.

Its forced some companies to re-route cargo, to avoid the attacks.