Generally in the US you are not required to carry identification but you are required to give truthful identification information when asked by a law enforcemen

Generally in the US you are not required to carry identification but you are required to give truthful identification information when asked by a law enforcement officer. If you didn't have your drivers license that day, you likely would have still received the warning ticket. If you lied about your identification, you may have gotten away with it but if caught in that lie, the consequences would have been much higher than a mere jaywalking ticket.