A not-comprehensive-but-moderate sampling of street signs in several California cities shows, (in every one I saw -- there may be some variants) the words paseo, camino, and calle all spelled out, usually in smaller type, right next to signs with the usual abbreviations of Ave, Blvd, Dr, etc. Never saw any abbreviation for the Spanish words.
For What That's Worth.
For What That's Worth.
Re: Spanish Abbreviations and TTS