Secondary Roads
Secondary roads are defined simply by the Iowa Code as those roads under county jurisdiction. The 99 counties in Iowa divide the secondary road system into farm-to-market roads and area service roads. Farm-to-market roads, which connect principal traffic generating areas to primary roads or to other farm-to-market roads, are maintained by the route's respective county and are paid for by a special fund. The Farm-to-Market Road Fund consists of federal secondary road aid and 8% of Iowa's road use taxes. The farm-to-market road system is limited to 35,000 miles (56,000 km).
Unlike other states in the United States, Iowa's signed secondary roads are not numbered on a county-by-county basis. With exception to County Road 105, secondary roads use a uniform numbering grid using one letter and two or three numbers, e.g., E41. County roads running primarily east and west assigned letters (from north to south) A through J. County roads running primarily north and south are assigned letters (from west to east) K through Z. The letters I, O, Q and U are not used to avoid confusion with numbers and other letters.
Read more about this topic: Iowa Primary Highway System
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