of January 2010, a reduced speed limit posted in a construction zone must be obeyed 24 hours a day, regardless of whether workers are present. As of March 27, 2018, the speed limit on I-90 from Randall Rd. in Elgin to Mt. Prospect Rd. in Des Plaines has been increased to 70 mph, and from Mt. Prospect Rd. to the beginning of the Kennedy Expressway, it has been increased to 60 mph. I-290 is posted at 60 mph for a few miles near Schaumburg, from IL-72 down to shortly before the I-355 exit. Indiana In Indiana speed limits on Interstate Highways are usually for cars and for trucks with a gross vehicular weight (GVW) of or greater. In urban areas, it is generally , except stretches of Interstate 70 in Indianapolis where it is . In suburban areas, it is for cars and for trucks. On Interstate 469 in Fort Wayne (Indiana's 2nd largest city) the speed limit is still set at 70 mph. The Indiana Toll Road also carries a minimum speed limit of as part of its internal toll road regulations. Most non-Interstate Highways are , but some rural four-lane divided highways are set at . These limits often decrease to approaching urban areas, and within cities a speed limit of is not uncommon, though larger arterial roads within cities may reach as high as . On February 6, 2012, the Indiana Toll Road was raised from the Illinois state line to mile marker 20 to after a major highway reconstruction project. Iowa In Iowa, the majority of highways have a speed limit. Rural Interstate Highways carry a limit and a minimum. Urban Interstate limits generally range from , but may be lower in areas. The Interstate 74 Bridge from Bettendorf to Moline, Illinois, for instance, has a limit because the bridge is narrow and has no shoulders. Four-lane roads may have a limit. If the road is built to freeway standards, such as US 20 between I-35 and Dubuque, it may have a minimum speed limit, but otherwise four-lane roads carry no minimum limit so slow-moving farm vehicles may use the roadway. Kansas After the National Maximum Speed Limit was repealed, Kansas raised its general interstate speed limit to ; a study found "no statistically significant increases in crash, fatal crash and fatality rates were noted during the after period on either rural or urban interstate highway