Handout 2 - San Jos State University CEE 122 Handout 2 HCM...

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San José State University CEE 122 Handout 2 - 1 - HCM 2000 Chapter 23 BASE CONDITIONS FOR BASIC FREEWAY SEGMENTS The base conditions under which the full capacity of a basic freeway segment is achieved are good weather, good visibility, and no incidents or accidents. For the analysis procedures in this chapter, these base conditions are assumed to exist. If any of these conditions fails to exist, the speed, LOS, and capacity of the freeway segment all tend to be reduced. The specific speed-flow-density relationship of a basic freeway segment depends on prevailing traffic and roadway conditions. A set of base conditions for basic freeway segments has been established. These conditions serve as a starting point for the methodology and represent a high operating level, with a free-flow speed (FFS) of 70 mi/h or greater. Minimum lane widths of 12 ft; Minimum right-shoulder lateral clearance of 6 ft between the edge of the travel lane and the nearest obstacle or object that influences traffic behavior;
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Handout 2 - San Jos State University CEE 122 Handout 2 HCM...

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