That is not an issue. It is the non stop driving that causes issues. They set the 4.5 hour limit for a reason. Research has shown that concentration and focus falls rapidly after this point for most people. They didn't pull the 4.5 hour figure out of their hat, nor did they do it just for bureaucratic reason.What I mean is a driver can work for 6 hours before he has to stop, if they do 4.15 driving and 1.45 loading or driving a crane , it’s still 6 hrs before a break of any sort.