I didn't see anything specific in the road naming guide for the US, but the following are being highlighted by #94 "lowercase street name (except country-specific words)":
el
la
de
These show up in some states (CA/AZ/NM) and elsewhere as lowercase on street signs. Should they remain lowercase in WME?
if not, let's add them to the exception list for US
if so, I will correct these in WME to be UPPER whenever I find them