Marshal with a blue flag, 2017 Link to this image full-size: https://www.racefans.net/2018/05/22/racefans-round-up-22-05/motor-racing-formula-one-world-championship-monaco-grand-prix-saturday-monte-carlo-monaco-257/Marshal with a blue flag, 2017Advert | Become a RaceFans supporter and go ad-freeMarshal with a blue flag, 2017