The driver safety arms race is phenomenon whereby car drivers are incentivized to buy larger auto-vehicles in order to protect themselves against other large auto-vehicles.[1][2][3] This has a spiralling effect whereby cars get increasingly larger, which has adverse overall effects on traffic safety.[4][5] It is an example of a prisoners' dilemma, as it can be individually rational to attain larger vehicles while having adverse outcomes on all traffic users.[6]
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