The 1981 Indianapolis 500 race became notable for an incident involving methanol, which burns with an invisible flame. During the race, a collision caused a fire that was not immediately visible. Methanol burns with a clear flame that isn’t easily seen in daylight, which makes the fire challenging to detect initially. Several race cars and a safety vehicle were involved in the incident, but , the response was quick once the fire was realized. | History In Pictures

In honor of what would have been Bobby Unser's 88th birthday, take a look back at his third #Indy500 win in 1981. What's your favorite memory of the legendary driver? | Indianapolis Motor Speedway