muckles:
Now how would you word Evil8Beezle suggestion about driving hours being re-set after a break, but not losing the remaining hours from your total driving time?
Sorry I couldn’t reply earlier but I’ve just got home 
How about something like this.
• Daily driving, 9 hours, can be extended to 10 hours 2 times a week. (regardless of when or how many breaks are taken, the total allowed daily driving time remains at 9 or 10 hours)