Stop close to the box until the police arrive
Pull over to the hard shoulder, then remove the box
Catch up with the lorry and try to get the driver's attention
Go to the next emergency telephone and report the hazard
The official DVSA guide to driving states:
Check that everything carried on your vehicle or trailer is safe and secure. If anything should fall from your vehicle or from another, stop on the hard shoulder and use the emergency telephone to inform the authorities. Never try to retrieve it yourself.
Rule 280 of the Highway Code states:
Motorways. On a motorway do not try to remove the obstruction yourself. Stop at the next emergency telephone and call for help.
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