Racing flags are traditionally used in auto racing and similar motorsports to indicate track condition and to communicate important messages to drivers.
Typically, the starter, sometimes the grand marshal of a race, waves the flags atop a flag stand near the start/finish line. On road courses, track marshals are also stationed at observation posts along the course in order to communicate both local and course-wide conditions to drivers.
Alternatively, some racecourses employ lights to supplement the primary flag at the start/finish line.The racing flag is also known as black and white chequered flag, black and yellow chequered flags, blue and white flag, chequered flag, chequered flag cars, chequered flag chiswick, chequered flag images, chequered flags, flag chequered, green and white flag.