It is not just distances travelled and activities undertaken that can cause driver inattention and fatigue.Time of day and time of year also take their toll.
In my job we have been involved in much research into such effects, especially since the introduction of 12 hours shifts for Ambulance staff. Despite resting during the day, it is really not natural for humans to be awake during hours of darkness, so the problem is escalated during the hours of darkness, and particularly evident during the winter months.
There is evidence too that drivers who have undergone advanced driving instructions are less likely to feel tired at the wheel, as are those who drive as a profession. It has something to do with levels of concentration on driving detail.
I know that in 37 years driving, I can honestly say that I have never experienced tiredness at the wheel, no matter what I have been doing leading to the drive, but try holding a “normal” conversation with me when I am driving. I am concentrating on the road so much that I cannot hold a “normal” conversation.
The research indicates that it is not so much tiredness that causes the problem, but inattention to detail during these bouts of driver fatigue that people not used to driving under such conditions suffer.
So, don’t just “employ” a separate driver, ensure that they are used to driving under such conditions too and are either advanced driver trained, or drive regularly in a professional capacity.
Edited: 30/09/2007 at 13:02