October, November, and December are the 3 biggest months in Illinois for DVAs, or deer-vehicle accidents.

The University of Illinois Extension points out:

Most deer-vehicle accidents (DVAs) occur during the months of October, November and December. Another peak occurs in May and June as one-year old deer are dispersing to new areas. However, DVAs can happen at any time of year. Deer are crepuscular, meaning that they are active at dawn and dusk. Thus, it is not surprising that most accidents involving deer happen between the hours of 5 to 10 p.m. and 5 to 8 a.m. While not all deer-vehicle collisions can be prevented, there are steps that drivers can take to avoid an accident.

Some of those steps include being aware of your surroundings.

  • Pay attention to deer crossing signs, and scan the roadsides for the "eyeshine" of deer (reflection of headlights in the deer’s eyes).
  • At night, use high-beam lights when appropriate. This may allow the deer to be seen a few seconds earlier, giving the driver enough time to avoid an accident.
  • Deer often use woodlots, fence-rows, field edges or areas near water. Extra caution is needed when these habitats are close to roadways.
  • Slow down and prepare to stop if a deer is along the side of the road. There are likely more deer nearby. Deer will often follow one another single file across a road. Trying to cross through the middle of such a group often results in deer colliding with the side of the vehicle.
  • If there are deer near the road, and there are no vehicles close behind, slow down, honk the vehicle’s horn in short bursts and flash the headlights.
  • Never tailgate! Always leave plenty of room between vehicles. Many severe deer vehicle accidents are caused when another vehicle becomes involved.

However, if all of your precautions fail, and you wind up having an accident involving a deer, the University of Illinois Extension advises you to:

  • Pull the vehicle off onto the shoulder of the road and turn on the emergency flashers.
  • Attend to any injured passengers. Do not get out of the vehicle to check on an injured deer or to pull a dead deer from the road. Do not risk being hit by another motorist.
  • Call 911 to report the accident. They will dispatch the appropriate law enforcement officials to assist at the site. Illinois law requires reporting of accidents that result in $1,500 or more in damage; additionally, an accident report must be filed.