9.2.2.2 Service Volume Tables
Generalized service volume tables are used for segment analysis, as described in . Service volume tables from the HCM 7th Edition can be used to evaluate individual segments or whole facilities of freeways, highways, and arterials. The roadway sections within a study area that are highest traveled should be selected for analysis.
A segment analysis using service volume tables following the below steps:
- Collect necessary data for the segment type ();
- An existing or anticipated volume higher than the service volume indicates the need for further analysis
If all the segments within a facility are operating within capacity (i.e., existing, or anticipated volumes are less than calculated service volume), there may not be queue buildup into other segments, indicating that a full facility analysis is not needed. These tables estimate maximum daily thresholds for a given LOS and default conditions. They are typically used as a general tool to identify specific segments that may need further evaluation. The tables are set for specific conditions and cannot be used as a final decision-making tool or as a substitute for engineering judgment. Comparing a segment’s demand to the service volume thresholds can provide a quick estimation of LOS and volume-to-capacity ratios of a segment.
Segment Type | Reference Table |
---|---|
Freeways (Basic) | Appendix J, Section 3, Table 1 (urban) or Appendix J, Section 3, Table 2 (rural) |
Multi-Lane Highways (Basic) | Appendix J, Section 3, Table 3 (urban) or Appendix J, Section 3, Table 4 (rural) |
Two-Lane Highways | Appendix J, Section 3, Table 5 |
Arterial Facilities | Appendix J, Section 3, Table 5 |