Time trial events will utilize lanes 3 and 4, alternating lanes about every 20 seconds (40 seconds per lane). If a boat is being overtaken by another boat in the same lane, the slower boat must yield to the outside lane (lane 3 will move to lane 2; lane 4 will move to lane 5).
Racing lanes are "double wide," meaning that 2 racing lanes share each set of buoys, and each racing boat has buoys on one side only.
Travel lane (heading upstream): there is no buoy line between you and lane 1. Boats in the travel lane are expected to stay close to the Lowell shore, well away from boats racing downstream.
If you are in a racing lane (heading downstream), this is what you should see on each side of you: