Grain harvest is underway, and one Midwestern state is providing an exemption. An influx of agricultural truck traffic has led state officials to grant a waiver of state requirements to ensure an “efficient and effective collection of the harvest.” Iowa issued a harvest proclamation on Sept. 10, which temporarily grants an exemption from the state’s size, weight and permit requirements. Ag haulers transporting overweight loads of soybeans, corn, hay, straw, silage, stover, fertilizer, manure