This occurred some months ago, possible as long as 18 months.
I was traveling north on West Chippens Hill Road in Burlington, CT. This was perhaps 1/2 to 3/4 of a mile north of the Bristol border.
It was early evening (4-6pm) and not dark yet.
An animal the size a large dog ran across the road, perhaps 50 feet in front of me. The sighting was very quick, as the animal was FAST. The animal did not seem to move like a dog or coyote would.
The color was a dark tan, with a very distinctive black tip at the end of the tail.
When I arrived at the relatives house that I was visiting, I informed them of the sighting and they did remark that mountain lions were seen in the area.
At that time I was skeptical, but my own Internet research into what mountain lions look like has convinced me that what I did see was a moderate sized mountain lion. At the time of the sighting, I did not know that the mountain lion tail was black-tipped.