Well, yes it does mate really.
But in reality, it can catch people on multi drop type work out, if they have a reasonably early break.
For example, start at 6 am. Have a break at 9.45 am,(45 mins). If you are doing lots of local work, you probably won’t hit 4 hr 30 mins DRIVING time, but at 4.30 pm you will need to have another 30 mins for WTD.
It’s easy to forget, because in your head, you had a 45 min break earlier.