Ho, Teck-Hua and Chong, Juin Kuan and Xia, Xiaoyu (2017): Yellow taxis have fewer accidents than blue taxis because yellow is more visible than blue. Published in: Proceedings of the National Academy of Sciences No. PNAS Early Edition www.pnas.org/cgi/doi/10.1073/pnas.1612551114 (March 2017)
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