When I try to build a part of a road where the blueprint overlaps an existing road, I receive the "Space Already Occupied" error. This prevents me from building three lanes of a road in one direction and then building the three direction back. This also prevents me from having the 'offramp' lanes split off gracefully because they overlap with the lanes continuing on. I hope that's explained adequately. I've tried recreating the very helpful Youtube video but I don't seem to be able to take the same actions without this error. Thank you for any advice on how to resolve this.