The cross streets of East Washington Avenue here are styled as 1st Street, 4th Street, etc. here on OSM. I know at the very least that the stops with BRT stations are signed on the ground in a "spelled out" way, e.g. First Street, Fourth Street. I'm not sure whether this applies to every single one of the "numeric" cross streets or just the major ones. I'm also not sure whether OSM has a specific set of best practices for preferring numbers vs words vs just replicating exactly what's signed