Dai
I do have rounds and a lot of them overlap, on certain days i will send the van so far, turn right then follow a route back, depending on how long I think the work will take, on the next day, the next driver might go the same direction slighly North then loop around the top of where the other driver got to, turn left and follow another route back, most days my vans are doing 100 - 180 miles and missing a town is a pain,
I have to set off in a while to cover a job which got missed last week and needs doing, it is 50 miles away, only a 10 min job, Saving grace is i hve about 6 small shops on the way back