Interstate 94 (I-94) runs east–west through the western, central, and southeastern portions of the US state of Wisconsin. A total of of I-94 lie in the state. Route description The route, cosigned with US Highway 12 (US 12), enters from Minnesota just east of the Twin Cities. The route passes north of Menomonie and south of Eau Claire before turning southeast and heading toward Tomah where it joins I-90. The two Interstates run concurrently for the next to Madison. I-94 enters the state as a six-lane facility which reduces to four-lane at exit 4 (US 12). I-94 passes by the popular tourist destination of Wisconsin Dells. The route converges with I-39 southeast of Tomah (near Portage). This concurrency () is the longest three-route concurrency of the Interstate Highway System and only one of two in existence. The interchanges mark a return to a six-lane configuration. I-94 turns eastward toward Milwaukee at what is commonly known as the "Badger Interchange" where the three Interstates meet with State Trunk Highway 30 (WISS 30). The highway returns to four lanes after the interchange traffic merges, then returns to six lanes just west of Waukesha. The highway remains a six-lane facility (with various auxiliary and collector–distributor lanes in Milwaukee at interchanges) east and south of this point, and through the area is officially designated the East–West Freeway, though very few organizations, including the Wisconsin Department of Transportation's traffic control center in the area actually use that name. I-94 passes through Downtown Milwaukee, turning southbound and joining I-43 for , into a road designated from Ozaukee County to the Illinois state line as the North–South Freeway. I-94 leaves Milwaukee to the south, joining with I-41 at the Mitchell Interchange. These two Interstates run concurrently to the border, passing west of Racine and Kenosha on their way into Illinois toward Chicago. Traffic is heavy along this stretch. Speed limits The speed limit on I-94 from the Minnesota border to the Waukesha–Milwaukee county border is . Entering Milwaukee County, the limit decreases to . The limit is until just west of the Marquette Interchange, where it decreases to . This limit continues to the Airport Interchange, where it increases to . Between Rawson and Drexel avenues, the limit increases to and maintains this limit to the Illinois border. History I-94 was the first section of the Interstate Highway System completed within the state of Wisconsin. This section,