WTD rules are pretty simple
Breaks less than 15 mins do not count
Do not work (driving+other work) for more than 6 hours at any time during your shift without taking a 15 min break
As you are likely to be working (driving+other work) for more than 9 hours in your shift then a total of 45 mins needs to be recorded
Driving time breaks
Do not record more than 4.5 hours of driving without taking at least a 45 min break
That 45 min break can be split into a 15 followed by a 30
Breaks can count for both WTD and driving time but the rules on driving time breaks take preference
Example for a 14 hour shift
work 2 hrs + drive 3 hrs
break 15 mins = 15 for WTD + 1st 15 of a split driving time break
work 1 hr + drive 1.5 hrs (now got to max 4.5 driving time)
break 30 mins = 30 for WTD + 2nd of a split driving time break = driving time now reset for another 4.5 hours
total shift time at this point is 8 hrs 15 mins
work 1 hr 45 mins + drive 4 hrs = 5hrs 45 mins so not reaching 6 hours for a WTD break
End shift