Expect to see a lot extra traffic on Interstate 80 around Newton Saturday and Sunday for the start of racing at the Iowa Speedway.The Wide Opening Weekend features the NASCAR K&N Pro Series Casey’s General Stores 150 and the NASCAR XFINITY Series 3M 250. Ten races over the course of four weekends are scheduled this year, Speedway officials said.HEAVY TRAFFIC I-80:That means anywhere from 17,000 to 40,000 people traveling to the race and leaving when it's done.  Many of the fans use Interstate 80.Expect heavy traffic about two hours before and after races especially around the 164 and 168 mile-markers and on Highway 14 south of Newton.Fans are encouraged to arrive at Iowa Speedway before 6 p.m. CT for the NASCAR K&N Pro Series Casey’s General Stores 150 this Saturday. The NASCAR XFINITY Series race is scheduled to start at 1 p.m. this Sunday. Parking lots open at 8 a.m. each day.The Iowa State Patrol, Iowa Department of Transportation, Newton Police Department, Jasper County Sheriff's Office and Iowa Speedway are working with a private traffic control company to erect signs and cones to mark travel routes for fans attending the races.Officers will be working intersections along the route to ensure traffic keeps moving.DESIGNATED TRAVEL ROUTES:All Race Traffic on Interstate 80:Take Interstate 80 to exit 168. Take exit 168 to Iowa Speedway Drive and turn south. Continue south on Iowa Speedway Drive and staff will direct you to the appropriate parking lot. Traffic will not be allowed to turn onto Rusty Wallace Drive from this interchange. Rusty Wallace Drive has been designated as an emergency route and will only be utilized for emergencies and to relieve traffic congestion.Use the same route when exiting Iowa Speedway.Newton Club Members and Suite Owners:Take Interstate 80 to exit 168 or exit 164. If arriving from the west, you are encouraged to utilize exit 164. Exit south onto U.S. 14. Continue traveling south on U.S. 14 approximately 3.6 miles. Turn east on South 60th Avenue. Continue east 2¼ miles and turn north on County Road S-74. Continue north 3.6 miles. Turn east on Rusty Wallace Drive; signs and staff will direct you to parking from there.Use the same route when exiting Iowa Speedway.TRAVEL TIPS FOR FANS:-- Buckle up for safety-- Allow plenty of travel time-- Plan on arriving early-- Be prepared for slow or stopped traffic-- Obey all traffic laws and follow signs, cones and signals-- Be patient-- Be courteous-- Do not stop to ask directions, officers and staff will direct you-- Follow directions of officers and parking staff-- Be cautious and watch for pedestrians-- Drink responsibly and always have a designated driver