The Bismarck Expressway is a state highway in Mandan and Bismarck, North Dakota, in the United States. It carries two unsigned highways: Interstate 194 (I-194) from its west end at exit 156 of I-94 to I-94 Business in Mandan, and North Dakota Highway 810 (ND 810) from I-94 Bus. in Mandan, around the south side of Bismarck back to I-94 Bus. in Bismarck. I-94 Bus. takes the designation from the end of ND 810 to the designation's eastern terminus at I-94 and US Highway 83 (US 83). The portion in Mandan, even where it is ND 810, is a freeway; once it crosses the Missouri River into Bismarck, it becomes a four-lane surface road.