Peak Hour Traffic (PHT)

Higher traffic volumes occur in the evening and in the morning because of work-related trips. The evening peak is typically the highest since non-work related trips are also made in this period. The percentage of Average Daily Traffic (ADT) which occurs in the evening peak hour commonly ranges between 7% and 12%.

Person Trip

A trip by one or more persons in any mode of transportation. Each person is considered as making one person trip. For example, four persons traveling together in one auto make four person trips.

Program

A list of specific actions to be implemented within an identified time period.

R

Record Of Decision (ROD)

The final approval of an Environmental Impact Statement issued by the Federal Highway Administration.

Right Of Way (ROW)

The land (usually a strip) acquired for or devoted to transportation purposes. For example, highway ROW and railroad ROW.

S

Single-Occupant Vehicle (SOV)

A vehicle having only one occupant (usually the vehicle operator!).

Social, Economic and Environmental (SEE)

The SEE affects of a project are assessed in environmental documents such as a Draft Environmental Impact Statement or Environmental Assessment.

Speed

There are several speeds. Design speed; is the maximum safe speed that can be maintained over a specified section of highway when conditions are so favorable that the design features of the highway govern. The design speed of a roadway dictates which geometric design standards are used such as stopping sight distance, radius of curves, and banking (superelevation) of road surfaces. Operating speed; is the speed at which drivers are observed operating their vehicles. Posted speed; is the maximum speed limit posted on a section of roadway using a regulatory sign. TxDOT's Procedure for Establishing Speed Zones states that the posted speed "should be based primarily upon the 85th percentile speed when adequate speed samples can be secured." This method has also been the standard practice nationwide. Speed limits can not be posted in excess of legislatively mandated speed limits. "85th percentile speed" is the speed at or below which 85 percent of drivers are operating their vehicles.

Statewide Transportation Improvement Program (STIP)

A staged, multi-year, statewide, intermodal program of transportation projects which is consistent with the Statewide Transportation Plan (STP) and planning processes and metropolitan plans, TIPs and processes. The STP is to be implemented within each 3-year period after adoption of the program, and it includes a financial plan that demonstrates how the program can be implemented. Requirement for the STP was established by the Intermodal Surface Transportation Efficiency Act (ISTEA) of 1991. The STP is developed in cooperation with the Metropolitan Planning Organization (MPO) programs.

Statewide Transportation Plan (STP)

The official statewide, intermodal transportation plan that is developed through the statewide planning process.

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