State wildlife officials are asking drivers to watch for bison as they migrate out of Yellowstone National Park north of Gardiner.
The Bozeman Daily Chronicle reports this year's combination of deep snow and increased tolerance for bison outside the park adds up to an increased chance of running into large animals on the roads in the Gardiner basin.
Two bison died last week after being struck on U.S. Highway 89 north of Gardiner.
The posted speed limit in the area is 70 mph, but state Fish, Wildlife and Parks officials are asking drivers to slow down and use caution, especially at night. Officials say the risk of hitting bison and other wildlife will remain high until May, when the bison are hazed back into the park.