This one is claiming Scorpios are involved in the least number of accidents and Virgos are "700 percent more likely to be in a car accident in the last year" than Scorpios. That's a pretty impressive variation, and even might suggest that astrology has some validity, but I suspect the insurance company has just made the figures up.
Doing a bit of Googling, it is apparent that other publicity-seeking 'studies' on zodiac signs by insurance companies give completely different results as to who are the best and worst drivers. This one by InsuranceHotline.com claims Leos are best with Librans worst:
I think I've sorted out the mystery of why there are 700% more accidents by Virgo drivers relative to Scorpio drivers. It's due to Allstate Insurance using a different version of the zodiac calendar from the normal one where each of the twelve star signs represents an approximately equal period. In their version of the zodiac, the 13th sign of Ophiuchus is brought into the mix, and it seems to change the period lengths of the other signs. The distribution is given on this webpage from 'wink news':