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Pages 134-139

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From page 134...
... 134 S e c t i o n 1 1 This section presents the conclusions and recommendations from NCFRP Project 41. 11.1 Conclusions This research project reached the following conclusions regarding better incorporating trucks into Highway Capacity Manual (HCM)
From page 135...
... conclusions and Recommendations 135 – In general, travel time, cost, and reliability (on-time performance) are the key determinants of route selection.
From page 136...
... 136 incorporating truck Analysis into the Highway capacity Manual single-truck class in the HCM, however, is inadequate to account for the significant performance differences between single-unit trucks and semitrailer truck combinations. Consequently, it is recommended that trucks in the HCM be split into two vehicle classes, resulting in the following five HCM classes for the purposes of HCM analyses: 1.
From page 137...
... conclusions and Recommendations 137 11.3.2 Expected Audience/Market for Research Product The expected audience for the research product is the transportation engineering and planning professional community involved in the planning and prioritization of all highway and street improvements. This includes private consultants or employees working for state DOTs, MPOs, cities, and counties.
From page 138...
... 138 incorporating truck Analysis into the Highway capacity Manual 11.3.6 Criteria for Determining Progress and Success The key criteria of success will be the adoption of the analysis methods developed in this project by public agencies, inclusion of the methodologies in FHWA guidance documents and the Highway Capacity Manual, adoption of truck LOS standards by state DOTs and other transportation agencies, and inclusion of the new methods in commercially available highway capacity analysis software. 11.4 Applicability of Results to Practice This research resulted in methodologies and a computational engine for predicting the impacts of highway and street investments on truck LOS, taking into account the relative economic importance to the community.
From page 139...
... conclusions and Recommendations 139 11.5.2 Objectives of Further Research The objectives of the further research would be the development and calibration of a new two-vehicle class (passenger cars and heavy vehicles) HCM method evaluating the capacity and performance (speed and density)

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