Detour Ahead (T1-6)The Detour Ahead (T1 6) sign warns motorists of a temporary traffic diversion or change in route due to roadworks, closures, or emergency conditions. By giving drivers advanced notice, it helps ensure smoother traffic flow and reduces the risk of sudden lane changes or confusion. Manufactured from yellow CL400 Class 1W reflective material, the T1 6 delivers exceptional visibility in both daylight and night time conditions, even in poor weather.