Uber General Manager Chris Taylor said it was unclear if Chicago would be the first U.S. city to test the safety device but noted that “as it is perfected, it will become something that is more broadly used.” The panic button was first implemented in India earlier this month following rape allegations against an Uber driver. Two Uber drivers in Chicago were charged in recent months with sexually assaulting a passenger. The upcoming safety measure was alternately referred to as an SOS button or a panic button by Uber officials Thursday.