owns 4,175 yellow taxis and 12,525 blue ones. All are the same model (a Hyundai Sonata) and all undergo the same maintenance schedules.,,,The difference in accident records was even more pronounced at night.
[Researchers] found that its blue taxis were involved in an average of 71.7 accidents per thousand vehicles per month while its yellow ones were involved in an average of 65.6. The yellow ones, in other words, were 9% less likely to have an accident.
What goes for cars probably applies to pedestrians as well. Having just bought a nice, but blue rain slicker, I'm now in the market for a yellow one...