spcregion.org

Website:https://www.spcregion.org
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Definitions (25)

1

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aadt


the total volume of traffic passing a point or segment of a highway in both directions for one year divided by the number of days in the year
Source: spcregion.org

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am peak


the morning time period when traffic volumes are highest; also referred to as “morning rush hour”; it can often be more than 60 minutes in length; typically falls between 7:00 and 9:00AM in the Pittsburgh region
Source: spcregion.org

3

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average speed


the length of a highway segment divided by the time it takes to traverse that segment, including all delays
Source: spcregion.org

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before and after study


a study undertaken to determine the effects of an implemented project, program, or policy change; performance measures are assessed before and after implementation to measure impacts; costs can also be taken into account and compared to benefits in order to gauge cost-effectiveness of the solution
Source: spcregion.org

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bluetooth


a federally mandated program within metropolitan planning areas to address and manage congestion; formerly known as a Congestion Management System (CMS)
Source: spcregion.org

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cms


prior to SAFETEA-LU, CMP was referred to as CMS
Source: spcregion.org

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congestion


the level at which transportation system performance is no longer acceptable due to traffic interference. The level of system performance deemed acceptable by State and local officials may vary by type of transportation facility, geographic location (metropolitan area or subarea, rural area), and/or time of day (23 C.F.R. § 500.109)
Source: spcregion.org

8

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corridor modernization


the frequency with which traffic accidents have occured along a defined roadway segment over a defined period of time
Source: spcregion.org

9

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delay


the amount of time it takes to traverse a given roadway segment minus the amount of time it would take to traverse that roadway segment at the posted speed limit if there were no interference; values are reported for AM and PM peak hours
Source: spcregion.org

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diverging diamond interchange


roadway lanes that are restricted for use by vehicles carrying a designated number of passengers (above 1) during peak times of the day
Source: spcregion.org


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