highway=motorway_junction with ref=[number] is used whenever there's an exit/junction number, whether or not it's actually on a motorway. But there are some numbered "exits" that are right at traffic signals, which should be tagged highway=traffic_signals. Examples include http://alpsroads.net/roads/nj/gsp/n10.jpg in south New Jersey (this one has a small separated "ramp" but another one doesn't), http://commons.wikimedia.org/wiki/File:NY_9A_north_exit_5.jpg in New York City, and http://gailmommers.50megs.com/pictmission/ny-17-exit-98.htm in upstate New York. How should these be tagged? highway=motorway_junction;traffic_signals?
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