The Illinois State Police are urging drivers to use extra caution around farm equipment as harvest gets underway across the state.

The advisory targets the weeks when combines, grain carts, tractors and other slow-moving machinery travel rural highways and county roads between fields, grain elevators and farmsteads. State police issued the public call ahead of the busiest stretch of the movement season, when the volume of wide, heavy equipment on two-lane roads rises sharply.

The core safety message is simple: farm machinery moves slowly and takes up more of the road than passenger vehicles expect. A tractor or combine traveling at low speed can appear on a rural stretch with little warning, and the closing distance between a car at highway speed and a slow-moving implement shrinks fast. Troopers are asking motorists to remain patient, reduce speed when approaching equipment, and pass only when the way is fully clear and sightlines allow it.

For farmers, the advisory carries a second implication. Operators moving equipment between fields are reminded of their own duties on public roads — using slow-moving vehicle emblems, running lights during low-visibility periods, and pulling over where safe to let traffic pass. State police framed the guidance as a shared responsibility between equipment operators and the motoring public during a compressed window when rural traffic patterns change.

The warning lands at a point in the calendar when Illinois roads carry a seasonal mix of grain trucks, tank wagons and harvesting machinery alongside school buses and commuter traffic. Rural intersections and hills with limited visibility are the recurring trouble spots in such advisories, and troopers are asking drivers to treat blind curves and crest lines with particular care.

Harvest is a time-sensitive operation, and delays from a collision — or from equipment sidelined in a crash — extend beyond the immediate safety consequences. State police did not outline enforcement measures tied to the advisory; the emphasis is preventive, aimed at reducing the seasonal spike in crashes involving agricultural vehicles before it materializes.

The agency's call adds Illinois to the list of states where law enforcement agencies issue similar seasonal reminders as combines roll. Drivers should expect the advisory to remain in effect for the duration of harvest activity, with equipment traffic tapering only once the state's principal crops are out of the field.

Troopers say the combination of patience, reduced speed and clear judgment on passing can prevent most incidents between highway vehicles and farm machinery this season.