Guidelines for Determining Traffic Signal Change and Clearance Intervals I By Douglas E. Noble, P.E., PTOE (F) TE has concluded a years-long effort to issue guidance on yellow change and red clearance intervals for signalized intersections. The final version of the Recommended Practice Guidelines for Determining Traffic Signal Change and Clearance Intervals (RP-040B) has been adopted by the ITE International Board of Direction and is now available.1 28 Ma rch 2020 ite j o u rn al Shutterstock/RomanYa ITE RECOMMENDED PRACTICE