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You’re driving along this motorway. It’s raining. When following this lorry you should*

A be aware of spray reducing your vision

The usual two second time gap will increase to four seconds when the roads are wet. If you stay well back you’ll be able to see past the vehicle, be out of the spray thrown up by the lorry’s tyres, give yourself more time to stop if the need arises, and increase your chances of being seen by the lorry driver.