isn't one.
Same as they are on county maintained paved roads. One still must obey posted speed limits and other cautionary signage.
If it is a single carriageway, then the speed limit will be 60mph, unless it states otherwise or there are legal enforcements in place (e.g. roadworks/speed restrictions.)
Yes!
The speed limit in North Dakota depends on the type of road you are traveling on. It is 55 mph if you are on a gravel or dirt road, paved two lane county road and township highways if there is not a speed limit sign posted.It is 65 mph on a two lane highway if the posted sign says 65. It is 70 mph on paved four-lane divided highways. It is 75 if you are on Interstate 29 or interstate 94.
A 125cc dirt bike generally hits a top speed of 60 mph. Consider this a top speed when racing Motocross or riding trails on a hardpack straightaway - the ideal setting for a dirt bike. However, if you must, on paved roads expect to hit close to 70 mph.
yes go for it
Naturally with such a large country only some, and mostly main roads can be paved. There are many dirt roads in all rural areas, as in every large country.
No.
Primitive dirt roads can be found in many out of the way places in the USA. This is because not all roads have been adopted and so have been laid with tarmac.
Cars were improved tremendously and roads were converted from gravel and dirt to paved roads.
No, you can only create paved roads and dirt roads.
They are both "graded."