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visibility
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Use of high intensity reflective sheeting in lieu of external lighting of overhead roadway signs
Retroreflectivity of Existing Signs in Pennsylvania
Executive Summary of Highway User Operational Information Survey
Updated Minimum Retroreflectivity Levels for Traffic Signs
Freeway Guide Sign Replacement: Policies and Criteria
Automated Mobile Highway Sign Retroreflectivity Measurement
Highway User Operational Information Survey
First Look at Visually Aimable and Harmonized Low-Beam Headlamps
Human Performance and Highway Visibility: Design, Safety, and Methods
Traffic Control Device Evaluation Program: FY 2017
Visibility Criteria for Signs, Signals, and Roadway Lighting