This is actually going to be an issue in the long run if we can't come to a consensus. I'm personally not sure how the internal rendering would work but I would presume that highway=trunk would be an appropriate classification as it was the *first* classification. My recommendation (with no internal knowledge whatsoever) is that you should also add highway=secondary:start_date as the key and then 1938 as the value then highway=secondary:end_date as the key and whatever as the value.
I've seen situations where the equals sign is used in keys alone and as far as I can tell, is the easiest way to represent the data, although possibly there are better solutions. Cheers, Luke
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