AA president Edmund King said: "This latest deer-related collision is an absolute tragedy. Our thoughts go out to the families and friends of the two teenagers.
"We have been warning of the dangers of deer collisions as October/November are prime months for deer collisions as it is the rutting season."
Mr King went on: "Hitting a deer presents a greater risk to motorists compared to other road kill incidents because of the large size of the animal.
"Drivers should be extra vigilant where there are deer-warning signs and slow down. Many additional accidents are caused by the tendency of drivers to over-react and swerve excessively."
Motoring, wildlife and safety groups repeatedly warn road users of the dangers of deer on highways. The toll of deer involved annually in vehicle collisions in the UK is estimated to be as high as 74,000.
Road accidents involving deer also result in more than 450 human injuries a year as well as several deaths.
Six main species of deer live wild in Britain with an estimated combined population of more than 1.5 million.