How to drive a two lane roundabout...A new video (3:05) produced for the NHDOT shows how to drive a two lane roundabout, like the one on US4/NH125 in Lee, which was built to address traffic congestion and safety issues. Some basic rules: always yield to both lanes of traffic when entering; never enter alongside a vehicle that is already in the inside lane; and know which lane you want to be in and stay in that lane. Check out the video