Chicago, IL – As winter conditions settle in across Illinois and nights grow longer, drivers near Chicago are being warned about a seasonal danger that spikes sharply this time of year: wildlife collisions after dark.
According to Illinois wildlife officials and transportation agencies, winter forces animals to change their movement patterns, bringing them closer to roads and highways—often during evening and early morning hours when visibility is reduced. Shorter daylight hours mean more drivers are on the road in darkness just as wildlife activity increases.
Officials say white-tailed deer, coyotes, foxes, and other wildlife are pushed toward roadways as food becomes scarce and frozen ground limits movement. In the Chicago region, animals frequently travel along forest preserves, river corridors, rail lines, farmland edges, and suburban green spaces, placing them directly in vehicle travel paths—particularly on outer beltways, arterial roads, and suburban highways.
Wildlife biologists note that winter alters feeding behavior, causing animals to move earlier in the evening and later in the morning. This overlap with commute times significantly increases the likelihood of crashes. Deer collisions are among the most common wildlife-related crashes statewide and can result in serious injuries, extensive vehicle damage, and traffic disruptions.
The Illinois Department of Transportation urges drivers to slow down in areas marked with wildlife crossing signs and remain especially alert between sunset and sunrise. High beams should be used when possible, but officials caution drivers not to swerve suddenly to avoid animals, as that can lead to loss of control or secondary crashes.
Drivers are also encouraged to watch roadsides carefully near wooded areas, open fields, and less-developed stretches on the outskirts of Chicago. Wildlife often travels in groups, meaning if one animal crosses the road, others may follow moments later.
As winter continues and daylight remains limited, officials say wildlife-related crashes will remain a serious risk across Illinois. Drivers are urged to use extra caution during evening and early morning travel, when animal movement is at its peak.
