Seems like the result you're looking for could be solved automatically by the renderers if they just displayed the exit numbers unless absent, then show the name...
For named exits such as http://www.aaroads.com/northeast/pennsylvania075/i-076_wb_exit_312_01.jpg , it would be proper to tag all 3 elements: name, ref, and destination. Dropping the name rendering for locations having a ref= tag might not be desirable for many locations.
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