The study by VTTI had the following result
A statistically significant difference in
critical incident relative frequencies
between the 1st driving-hour and all other
driving-hours
■ However, there was generally no statistical
difference between the 2nd through 11th
driving-hour .
The hour with the most frequency of accidents is the first hour . Joan Claybrook likes to rant about driving consecutive 11 hour days .
Therefore if a driver's job requires driving 55 hours a week , under the 11 hour rule the work can be accomplished in 5 days . Under the 10 hour rule an additional day will be required using 20% more dangerous first hours per week .
A statistically significant difference in
critical incident relative frequencies
between the 1st driving-hour and all other
driving-hours
■ However, there was generally no statistical
difference between the 2nd through 11th
driving-hour .
The hour with the most frequency of accidents is the first hour . Joan Claybrook likes to rant about driving consecutive 11 hour days .
Therefore if a driver's job requires driving 55 hours a week , under the 11 hour rule the work can be accomplished in 5 days . Under the 10 hour rule an additional day will be required using 20% more dangerous first hours per week .