Yellow taxis have fewer accidents than blue taxis because yellow is more visible than blue
Proceedings of the National Academy of Sciences (2017) - Comment
pubmed: 28265081  doi: 10.1073/pnas.1612551114  issn: 1091-6490  issn: 0027-8424 

Teck-Hua Ho, Juin Kuan Chong, Xiaoyu Xia