Operating speed

{{short description|Speed at which motor vehicles generally operate on a road}}

The operating speed of a road is the speed at which motor vehicles generally operate on that road.

The precise definition of "operating speed", however, is open to debate. Some sources, such as the AASHTO, have changed their definitions recently to match the common use of the word. In 1994, the AASHTO Green Book{{cite book|title=A Policy on Geometric Design of Highways and Streets: 1994|publisher=American Association of State Highway and Transportation Officials|isbn=1-56051-068-4 }} defined the operating speed as "the highest overall speed at which a driver can travel on a given highway

under favorable weather conditions and under prevailing traffic conditions without at any time exceeding the safe speed as determined by the design speed on a section-by-section basis," a definition which a majority of US states still use.{{cite web|url=http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_rpt_504.pdf|format=PDF|title=Design Speed, Operating Speed, and Posted Speed Practices (Report 504)|publisher=National Cooperative Highway Research Program}} In July 2001, however, the AASHTO revised their definition for the new edition of the Green Book{{cite book|title=A Policy on Geometric Design of Highways and Streets: 2001|publisher=American Association of State Highway and Transportation Officials|isbn=1-56051-156-7 }} and defined it as "the speed at which drivers are observed operating their vehicles during free-flow conditions."