An TW-15 Manual Traffic Control Diamond sign, also known as a TA2 Sign or a Flag Men / Man Sign, is normally only used at work sites on two lane, two way roads to provide advance warning of manual traffic control. You are also required to use a Stop / Go Paddle as part of the traffic control of the work site. It can be used on Level 1 Roads in conjunction with a TW-18 Please Stop on Request TW Supplementary.