[mkgmap-dev] What exactly does this error mean and how to fix it

Hi All, I have been going through the mkgmap log fixing problem it's picked up, most are self explanitory but the one below I cannot see how to fix it. I can see the node does share a motorway, not sure what is wrong. 2011/04/05 16:56:42 WARNING (StyledConverter): 63240007.osm.gz: Motorway exit E3 (http://www.openstreetmap.org/?mlat=-37.83159&mlon=145.00286&zoom=17) has no motorway! (either make the exit share a node with the motorway or specify the motorway ref with a exit:road_ref tag)