Pre-occupied drivers who fail to focus on the road will often experience periods of memory loss, Northland police warn.
Regional road policing manager, Inspector Murray Hodson, said distracted drivers endangered all road users.
"You've got to maintain the highest level of concentration.
"We can all recall when we've driven along the road and can't remember the corner we've taken."
His comments follow the release of new research into Kiwi drivers showing at least a third of motorists came close to crashing in the past six months.