While it can be very annoying that people are parked on the grass or side of the road, it is not forbidden. It's not really that dangerous as it would be in real life, you can see oncoming or stopped vehicles on your GPS. ,As I see in your video though, you have your gps on the right side turned off. I do not recommend driving the C-D road like that, it's a lot better when having it turned on so you have a better view of the map and the blue player-dots.