Exemptions

article 5 + 5.  Article 3 does not apply to a vehicle—

article 5 a + (a)being used for police, ambulance, fire, or rescue authority emergency response purposes;

article 5 b + (b)proceeding at the direction of, or with the permission of, a police constable, traffic officer in uniform, or an appointed person; or

article 5 c + (c)being used for maintenance purposes on the M48 Severn Bridge.