limit on Interstate and primary highways of , but only when signs are present. The only roadway in North Carolina currently with a minimum speed limit is the I-77 Express Lanes, with a minimum of 45 mph. Generally there is no minimum on interstates to allow for slow moving farm equipment. Highways do not generally have separate truck speed limits in North Carolina. There are a few exceptions however, such as I-40 from Old Fort to Black Mountain (35 mph) and from Hendersonville to the Tennessee state line (50 mph) These limits are in place due to dangerous mountain curves and grades. North Carolina operates a Safe Driving Incentive Plan (SDIP), a program that leads to insurance surcharges for moving violations based on a point system. In general, for speeding violations less than 10 mph over the posted speed limit in a speed zone less than 55 mph, one point is assessed; two points are assessed for exceeding 10 mph over the limit or speeding in a zone with a speed limit of greater than 55 mph. A driver's license will be suspended for traveling faster than 15 mph over the speed limit, provided the speed traveled is greater than 55 mph; suspensions can result for other speeding infractions, such as traveling faster than 75 mph in a 65 mph or less zone or faster than 80 mph in a 70 mph zone. North Carolina law makes exceeding 80 mph anywhere in the state (regardless of the posted speed limit) a Class 3 Misdemeanor, as well as exceeding 15 mph over the posted speed limit. In 2013, the North Carolina Senate passed a bill to explore raising the speed limit on certain low volume freeways to . The bill would have given the DOT permission to raise the speed limit on freeways deemed safe for 75 mph travel. However, the House defeated the bill, and no efforts have been made to raise them since. North Dakota North Dakota's major interstates, I-29 and I-94, have a 75 mph speed limit in most rural areas, with 55-75 mph zones within portions of the Fargo and Bismarck/Mandan urban areas (I-29 in Grand Forks is signed at 75 mph). The state's 4 lane Divided Highways as well as 2 short stretches of undivided 4 lane highways (US 2 around Rugby and U.S. 83 as it passes the eastern Lake Sakakawea Reservoir) usually carry a