WTD question

Example

6 - 7 work
7 - 9 drive
9 - 10 work
10 - 12 drive
Now got to 6 hours for WTD so 15 min break needed which also counts as the first of the 15 (+30) for driving time break
12.15 - 1 work
1 - 1.30 drive
Now got to 4.30 driving time so the second of the split driving time break needed which must be at least 30 mins - also counts for WTD so the 6 hour working time break is also reset
2 - 4 drive
4 - 6 work
6 - 8 drive
Now got to 6 hours WTD again so 15 min break needed
8.15 - 9 work

15 hours shift completed with all breaks taken for WTD and driving time requirements