MyWiki:WikiProject U.S. Roads/Shields task force/Research
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{{Wikipedia:WikiProject U.S. Roads/Dept header |logo= Gnome-colors-applications-office.svg |dept=Shield research |type=sub }}{{Wikipedia:WikiProject U.S. Roads/nav|type=dept}}
- Federal Manual on Uniform Traffic Control Devices
- Standard Highway Signs (Customary measurements)
- Standard Highway Signs (Metric measurements)