McDonald's drive-thru customers have been warned a new law could see them fined by up to £200. Motorists using their phone while behind the wheel in stationary traffic could receive a fine, as well as six points on their licence.The law means nobody can use their phone while at traffic lights, motorway queues or even a drive-thru, reports Liverpool Echo.READ MORE: McDonald's proposal goes horribly wrong as food is delivered to wrong houseThere are some exceptions, for example, if someone's making an emergency call or using their phone to pay at the drive-thru.Rule 149 of the Highway Code said: "You must exercise proper control of your vehicle at all times.