Motorists in South Yorkshire and North Derbyshire are being urged to give the roads their full attention.
The appeal comes after research found a third of drivers lose concentration when they are behind the wheel.
The survey by the Institute of Advanced Motorists found that, for a quarter of those drivers, absent-minded day-dreaming was the most common cause of their lapse in concentration.
Other reasons drivers gave for not concentrating included stress, and thinking about family, friends and personal relationships.
The warning was issued by the Derbyshire Road Safety Partnership.