This research studies the upgrade programs implemented by Sioux City, IA, Mendocino, CA, Putnam County, NY, and the Insurance Institute of British Columbia, Canada, and identifies other projects that upgraded sign materials. The research evaluates each implementation practice and examines the crash results, including crash types, sign locations in relation to the crashes, time of day, light vs. dark, weather, and other factors that may have influenced the signs’ effectiveness. In addition, state and/or national baseline crash information for the same time periods will help establish trends. 

This study investigated the effect of (legend) luminance and letter size on the information acquisition time and transfer accuracy from simulated traffic signs.

Report FHWA-RD-03-082 presents the results of a study that investigated the nighttime visibility needs of drivers for viewing overhead guide signs and street name signs. This effort reviewed past research and current practices to design a series of field tests. 

Over the years, ATSSA has demonstrated that the installation or upgrade of roadway safety features – many of them available at low-cost – can provide immediate and substantial safety benefits for all. The expertise, knowledge and experience of ATSSA members are in the development and installation of traffic control devices and roadside safety features that make the roadway safer and more forgiving for all users of the roadway system. This document (in large part) focuses on the policies and practices needed to move America Toward Zero Deaths (TZD).

The Federal Highway Administration (FHWA) is improving its process for issuing Federal-aid eligibility letters for roadside safety hardware systems. The FHWA's Federal-aid eligibility letters are provided as a service to the States and are not a requirement for roadside safety hardware to be eligible for Federal-aid reimbursement. 

The National Cooperative Highway Research Board provided a review and update of the American Association of State Highway Transportation Officals' "Roadside Design Guide."

The FHWA is exploring several potential options for reviewing, evaluting, and accepting the results of crash testing of roadside safety hardware that is intended to be used on the National Highway System (NHS). The options are for discussion only.

The FHWA issued a memo in April 2018 to provide guidance to the FHWA Division Offices to assist in their evaluation that a state DOT has an acceptable process for determining the crashworthiness of roadside safety hardwareused on the National Highway System (NHS).

Roadway safety infrastructure can mean the difference between life and death when crashes happen, and guardrail are an important part of that infrastructure.