BISMARCK, N.D. (AP) — Statistics show that the main north-south artery in North Dakota's oil patch is the most dangerous stretch of road in the state.

The 2014 report from the state Department of Transportation shows that U.S. Highway 85 had the most fatal accidents, injury accidents and property damage accidents.

Portions of U.S. 85 also have some of the highest traffic volumes in the state. Other high-traffic areas are Interstate 94 east of Valley City and I-29 from Grand Forks through Fargo.

The state is spending hundreds of millions of dollars on upgrades to the highway. DOT spokeswoman Jamie Olson says the agency also is making changes such as slowing speeds at a dangerous intersection near Williston. But she says highway engineering can't overcome people who drive after drinking or don't wear seatbelts.