Assertion: turn signal | /r/HasProperty | amber
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text: A 2008 US study by the National Highway Traffic Safety Administration suggests vehicles with amber rear signals rather than red ones are up to 28% less likely to be involved in certain kinds of collisions, a followup 2009 NHTSA study determined there is a significant overall safety benefit to amber rather than red rear turn signals, US studies in the early 1990s demonstrated improvements in the speed and accuracy of following drivers' reactions to stop lamps when the turn signals were amber rather than red, and NHTSA determined in 2015 that amber rear turn signals can be provided at comparable cost to red ones.