Deer are becoming more active, and the Pennsylvania Game Commission says the end of daylight saving time will put more drivers on the road when the animals move most.
The agency is advising drivers to slow down and stay alert during the fall breeding season known as the "rut."
Many yearling bucks in autumn move from the areas where they were born and travel sometimes several dozen miles to find new ranges.
Adult bucks in the fall cruise their home ranges more often in search of does, and sometimes chase the does they find.
Deer also feed more in the fall to store energy for winter, and people tend to spend more time outdoors where they can unintentionally chase the animals from forests.
A driver who hits a deer is not required to report it to the Game Commission, but Pennsylvania residents may claim the carcass by calling the agency's region office in the county where the accident occurred within 24 hours.
Antlers must be turned over to the Game Commission or purchased for $10 per point. Removing antlers from road-killed bucks is illegal.
Dead deer can be reported for removal from state roads by calling PennDOT at 1-800-FIX-ROAD.