Interstate 393 (I-393) is a 4.594-mile (7.393 km) east-west freeway spur extending from Interstate 93 at Concord, New Hampshire, to Pembroke, New Hampshire, United States. The primary purpose of the road is to bypass a densely built commercial strip on Route 9 in the eastern part of Concord. Several times a year, I-393 also serves traffic to events at New Hampshire Motor Speedway in Loudon. I-393 runs concurrently with US 4 and US 202 for its entire length.