New Karlovo Namesti Metro Station Sign, Prague, CZ, 2009

Standard Prague Metro station signs are color coded to match the color of the line, meaning green for the A line, yellow for the B Line, and red for the C line. The signs on the far side of the track are an exception, as they're made from metal letters attached to the wall. Karlovo Namesti, however, recently bucked this trend when these blue station signs were put in on the passenger side of the platforms...for the B line. Theoretically they should be yellow, as the blue line is only projected as of now, and my understanding is that once constructed the blue line will have dedicated platforms. I'm almost wondering if these signs are a test to see whether the new signs will look right.