A while ago I posted on the dilemma facing RTA: Do we support LA's TAP card, or San Diego's Compass card? Are they interchangeable?
Well, it turns out MetroRiderLA did a little experimenting and SD's fare machines recognize LA's TAP card- so we may very well be able to use both. Sweet!
Of course, there may be legal/regulatory barriers in the way, but if this turns out to be a-okay, then it's great for Riverside County.