http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Quantifying the benefits of separating pedestrians and vehicles
American Association of State Highway and Transportation Officials
"Research sponsored by the American Association of State Highway and Transportation Officials, in cooperation with the Federal Highway Administration."
Report (National Cooperative Highway Research Program) ; no. 189