leading causes of deaths are often multi factorial
1 failure to look properly 33% lack of attention tiredness would be included here
2 lack of judgment of others' speed / postion risk taking to overtake etc 19%
3 carelessness including speeding being on the phone etc18%
4 losing control ice rain snow tiredness falling asleep, corners too fast 17%
5 drink driving 13%
tiredness is often mixed in with other things so is in categories 1, 3 and 4
however over the past 30 years road fatalies are down by more than 60% despite the increases in traffic population etc, child deaths are down 88% from 450 a year 30 years ago to 54 now, the biggest factors are seatbelts and drink driving decreasing dramatically,
seatbelts were intorduced in 1991 for all seats deaths were 4500 a year, since 2015 the average is 1600 per year