Whenever I drive to Auckland I always think about the traffic in the city before I leave and plan my trip to avoid traffic congestion. Even if I don't have to worry about getting somewhere on time, I still resent any time spent sitting in traffic in the city. When it happens I try to tell myself not to be like my father whose hatred for traffic (and traffic lights) was often a source of amusement to his offspring.
On the other hand it doesn't matter one iota has long I have sit behind a flock or sheep or heard of cows on a rural road. It is always a pleasant experience for me. Of course, it helps if my camera is handy and I have time to fire off a quick shot out the car window.
These sheep know the drill and mainly stick to the road as they are moved from paddock to paddock. The roadside fences are there but don't seem necessary.
They are pretty important when the flock reach their destination.