On many junctions and roundabouts, there are set lanes for turning left/right/straight ahead. For those not familiar with these roads it would be an invaluable addition if your set route could alert you to which lane you need to be in. I have often gotten myself into the wrong lane and taken the 'scenic route' because it hasn't been clear until too late which lane I am needing and I know many, many other drivers that have hit this problem, sometimes taking us miles out of our way to get back on route.
Thank you for your consideration :o)