TRB's National Cooperative Highway Research Program (NCHRP) Web-Only Document 255: Improved Analysis of Two-Lane Highway Capacity and Operational Performance supplements the sixth edition of the Highway Capacity Manual (HCM). Specifically, this project includes the following updates:
This project also introduced features to improve the ease of use of the methodology in the HCM, such as the elimination of tables requiring interpolation, treating trucks explicitly instead of through PCE values, using a single service measure and eliminating the PTSF measure.
Table of Contents
|2. Research Approach||11-62|
|3. Analysis Methodology Development||63-90|
|4. Summary and Recommendations||91-93|
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