As the days get shorter the bucks' hormones run rampant. Bucks are busy marking their territory with scents, and leaving their mark to let other bucks know this is their area, at the same time letting the does know they are available. Does will go into estrous and within a 24 hour period be ready to breed, and the buck wants to make sure he is there for it. Bucks lose most of their common sense during the rut, which makes it a perfect time for hunters to stick it out. Most of the trophy bucks are taken during the 11 am-1 pm stretch during the rut. A lot of times this coincides with a lunch break for hunters, but following the advice of "pack a sandwich and stick it out" might just help pay off with a trophy buck for the taking.
For motorists, be on the watch, if one deer has run across the road, there will probably be another in pursuit. They aren't being their shy or smart selves during the rut. From The Pocono Record .