Section Tra 311.07 - Location(a) A DWI sign assembly shall be located on the right hand side of the roadway at a location to be determined by the department in compliance with these rules.(b) A DWI sign assembly shall be erected no further than one mile in either direction of the traffic accident site except as determined by the department:(1) As necessary to integrate with other official traffic signs; or(2) As necessary to prevent distraction of motorists due to the number of existing official and private signs, traffic control devices, and driveways.(c) A DWI sign assembly shall only be erected adjacent to the same roadway as the traffic accident site except in the case of an at-intersection traffic accident, the sign shall be placed adjacent to either of the involved roadways.(d) A DWI sign assembly shall not be erected in any area prohibited by law, including the interstate system, turnpike or other limited access divided highway system.N.H. Admin. Code § Tra 311.07