It was dusk around 5:30pm going west bound on Rt. 2. Just before the Concord jail on the right hand side of the road I saw for a few seconds a small glowing green craft just before I was blocked by trees. Then looking again in the same direction after clearing the trees it was gone. There were many other cars around as well who must have seen it and dismissed it as a plane or drone. It was bigger than a drone though and much quicker with no visible propeller. It was a greenish glowing triangular shape and was dipping down as if landing across the street from the jail in the field, but I saw no such thing when I got to the circle. I am wondering now if the Boxboro sighting was the same that day being nearby.