Thanks for the info - in order to help you I've tagged the road as a single lane and also added the tag incline=up near your note.If you could add the % incline this might deter hgv routing using our data. Also if you could indicate which sections have the steepest inclines with %.If you also add the width in metres that would also help. Unfortunately the only way to absolutely prevent hgv routing using our data requires a legal weight or width restriction with suitable signage in place.