Maybe you've recently landed in Barcelona with a bike bag full of goodies. Or perhaps you're staying here a while and finally you got your hands on a new shiny bicycle. Either way, you've got your foot on the pedal and you're looking around rather excited. You notice...a bike path painted...red?, a small traffic light flashing...a green bike shape?, a cyclists whistling away riding on...the pavement?! Are there any rules around here?