From Hudson NH, the bridge that is an entrance to route 3 frequently has a speed trap shortly after the exit to the DW highway. There’s a slight left curve which can easily conceal an officer that targets people before the highway splits so you can go north or south. Hudson police can be occasionally found at the entrance to the bridge in addition to this. Going the other way (towards Hudson), there is frequently an officer in the median area, on the grass, targeting those going to Hudson. Speed limit is 45mph, and it’s very common to be coming off the highway going 60+ in the area. Police presence is common enough that I wouldn’t recommend going more than 5MPH over the limit around here.