255.1 Without limiting the generality of section 718.2, where a court imposes a sentence for an offence committed under this Act by means of a motor vehicle, vessel or aircraft or of railway equipment, evidence that the concentration of alcohol in the blood of the offender at the time when the offence was committed exceeded one hundred and sixty milligrams of alcohol in one hundred millilitres of blood shall be deemed to be aggravating circumstances relating to the offence that the court shall consider under paragraph 718.2(a).