I've created a proposal for an extension of the sub-tags (ref=* and exit_to=*) of highway=motorway_junction. This is to help people on tagging highway ramps that split farther down after they leave the main highway. It will also help deal with other motorways splitting off of the main motorway when both are tagged as motorways (instead of motorway and motorway_link).
You can see the proposal here: http://wiki.openstreetmap.org/wiki/Proposed_features/motorway_junction_Extension -- James (rickmastfan67)
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