[Pantone Value] YellowC [Meaning] A single yellow indicates danger ahead, such as debris from a crash. Drivers must slow down as they pass; no overtaking is permitted, unless it is unavoidable such as a driver retiring in the section, or a driver is lapped.[7] Two waved yellows at the same post indicates great danger ahead. Drivers must slow down and be prepared to stop; no overtaking is permitted unless a driver is lapped.[7] Yellow flags and the SC board (a large white board with "SC" in large black lettering) indicate that the Safety car has been deployed. Drivers must slow down, not overtake and be prepared to leave the normal racing line or even stop as a threat obstructs all or part of the track. [Description] 
Yellow
Y e l l o w
G r e e n
R e d
B l u e
W h i t e
B l a c k
C h e q u e r e d
H a l f b l a c k
B l a c k w i t h o r a n g e c i r c l e
Y e l l o w a n d r e d s t r i p e s