http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Gap acceptance characteristics for ramp-freeway surveillance and control
Research project number 2-8-61-24. Freeway surveillance and control. On cover: Level of service.
Sponsored by the Texas Highway Dept. in cooperation with the U.S. Dept. of Commerce, Bureau of Public Roads.