I worked for a large trucking company that trained their own drivers. They found that new drivers had a lot of accidents, small ones, trailer doors ripped off or mirrors broken. Drivers with two or more years had more bad, fatal, accidents.
Same here - new guys made procedural mistakes, older guys made complacency mistakes which tended to be more fatal.
Doesn't take long to get rather lazy and at ease behind the wheel of a truck.
