the vehicle
bc you don't want to hit it and its illegal
Land which has not yet been divided into states is almost always referred to as a "territory". Many of the places that are currently states in the US began as territories, such as Alaska.
You should keep your speed steady and let him switch lanes safely. You should never speed up because it could cause a crash. You should stick to your lane and be careful on who's behind you as well. If there's nobody behind you you can also reduce speed to help him do it safer. If there are people behind you you should just keep the same speed without endangering the people around you.
I believe it is the Germanic branch.