Hi chaps,
The Live Map has started showing the elevations of roads.
Lower elevations (tunnels, underpasses) are shown opaque with a dashed border to demonstrate that they are under other roads.
Higher elevations (bridges) are shown with bold lines on the outside of the segment to demonstrate the side of a bridge.
This is most likely a precursor to these elevations being shown properly in the client (the Live Map proved this with runways, railways etc). As such I would request that all editors pay attention to this field and update the segments they are working on accordingly.