In the week before Christmas police are warning drivers to be extra vigilant on the roads.
"It's really important that people take the time to prepare themselves for the trip away after the very busy build up to Christmas," acting Southern District Road Policing manager Senior Sergeant Steve Larking said.
"If you are having trouble concentrating or feeling tired you must pull over and have a rest. There is no point in putting your life and that of other road users at risk because you are tired."
When on the road often the front passenger is in a very good position to help make decisions about what is going on, when to stop for a rest and where, or to share the driving, he said.
"There are various steps a driver can take such as stopping for a 20-minute nap or sharing the driving. Tired drivers are a danger on the road and we all need to be aware of that.