Roads for public transport should be drawn as Pedestrian Boardwalk unless they can be used by taxi's. In this picture some lanes for public transport are drawn as PB and one as regular Street with restrictions to allow Taxi traffic.
If used for public transport lock on L4 and set the elevation to -5. As pedestrian area the elevation is "ground" level
The previous standard was using Walking Trails for public transport lanes. This is changed into using Pedestrian Boardwalks for public transport because both non-drivable roadtypes have now both a fix. Preference for PB because public transport lanes shouldn’t have (by accident) destinations.