Winter weather can increase traffic hazards due to its effect on road conditions: snow and ice create conditions were cars can slip and slide. The increasing darkness in the evenings and mornings can also impact driving conditions.
However, there is another factor in the approach of winter, and that is an increased likelihood of vehicles colliding with deer. According to the Boston Globe, deer-vehicle accidents rise roughly threefold in the season between late October and December. That means that Massachusetts drivers have a 1 in 452 chance of a crash involving a deer annually. While that incidence is less than many states, a collision with a deer is certainly best avoided. The Boston Globe quotes State Farm Insurance as saying that 10,333 accidents occurred in the 2009-2010 period. (Exact statistics for Massachusetts are not compiled, as drivers are not mandated to report any collisions with deer, unlike other types of traffic accidents.)
Collisions with deer have become more frequent in recent decades as suburban expansion has pushed into areas that were once farmland or forested.
That said, how does one avoid a collision with a deer? First, recognize that deer are active in the October through December period because it is mating season. Deer are more mobile during mating season, so increased vigilance by drivers is advised.
Second, many of the tips for avoiding a deer accident are the same as those for safe winter driving overall. Actively employ your headlights, and make sure you use the brights when appropriate. Make sure that you can safely stop in the area you can see with your headlights. Drive at a reasonable rate of speed given the conditions and the weather—and recognize that it may need to be under the speed limit if conditions warrant.