I've heard over the years green was an unlucky color in race cars and presumably in other vehicles. Snopes.com had an article about Lee Oldfield in 1911. Apparently, in Syracuse New York, he blew a tire out, went through a snow fence into the infield and killed 11 people and injured 10 others. The crash threw Oldfield out of the car but he was relatively uninjured. The website went into other instances since then as well.
I don't believe in such things but, whatever.