Project Number	Project Title	Stage	Comments
NCHRP 05-10	A Mobile System for Measuring Retroreflectance of Traffic Signs	Completed
NCHRP 05-11	Implementation Strategies for Sign Retroreflectivity Standards	Final
NCHRP 05-12	Requirements for Application of Light Emitting Diodes (LEDs) to Traffic Control Signals	Final
NCHRP 05-13	Illumination Guidelines for Nighttime Highway Work	Completed
NCHRP 05-13(2)	Illumination Guidelines for Nighttime Highway Work	Completed
NCHRP 05-14	Advance Warning Arrow Panel Visibility	Completed
NCHRP 05-15	Visibility Performance Requirements for Vehicular Traffic Signals	Completed
NCHRP 05-16	National Calibration Standards for Measuring Retroreflectivity	Completed
NCHRP 05-17	Safety Evaluation of Permanent Raised Pavement Markers	Completed
NCHRP 05-18	Color Effectiveness of Yellow Pavement Marking Materials	Completed
NCHRP 05-19	Guidelines for Roadway Lighting Based on Safety Benefits and Costs	Completed	The research has been terminated. Papers on various aspects of the research are available at the links provided below.
NCHRP 05-20	Guidelines for Nighttime Visibility of Overhead Guide Signs	Completed
NCHRP 05-21	Safety and Performance Criteria for Retroreflective Pavement Markers	Final	Research complete. Final Report published as NCHRP Research Report 1015
NCHRP 05-22	Guidelines for Solid-State Roadway Lighting	Completed
NCHRP 05-22A	Gaps and Emerging Technologies in the Application of Solid-State Roadway Lighting	Completed	Publication decision pending.
NCHRP 05-23	Effects of LED Roadway Lighting on Driver Sleep Health and Alertness	Completed
NCHRP 05-24	Development of Guidelines for Vehicle and Equipment Marking and Lighting	Final	Published as NCHRP Report 1085 on 1/23/2024
NCHRP 05-25	Guide to the Contextual Application of Overhead Lighting on Highways	Active
NCHRP 05-26	Development of Updated Warrants for Roadway Lighting	Active	Research in progress.
NCHRP 05-27	Guide for Lighting at Innovative Intersections/Interchanges, including Roundabouts	Active	Research in progress