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Titre du document / Document title

Determining critical length of grade for geometric design of vertical alignments

Auteur(s) / Author(s)

TORBIC Darren J. (1) ; HARWOOD Douglas W. (1) ; RICHARD Karen R. (1) ; GLAUZ William D. ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Midwest Research Institute, 2362 Raven Hollow Road, State College, PA 16801, ETATS-UNIS

Résumé / Abstract

In the 2001 Green Book, critical length of grade is generally defined as the length of grade that would produce a speed reduction of 15 km/h (10 mph) for a 120-kg/kW (200-lb/hp) truck. The Green Book does not provide an appropriate tool for highway engineers to calculate critical length of grade for locations where a truck with a weight/power ratio other than 120 kg/kW (200 lb/hp) is appropriate. Research was conducted to determine the distribution of truck weight/power ratios in the current truck fleet in several regions of the United States. The results suggest that, for design purposes, a truck with a weight/power ratio of 102 to 108 kg/kW (170 to 180 lb/hp) would be appropriate for freeways in California and Colorado, although a weight/power ratio of 126 kg/ kW (210 lb/hp) would be more appropriate in Pennsylvania. For two-lane highways, a 108-kg/kW (180-lb/hp) design vehicle may be appropriate in Colorado, although less powerful design vehicles in the range of 150 to 168 kg/kW (250 to 280 lb/hp) may be appropriate for California and Pennsylvania. A truck speed profile model also was developed that enables highway designers to calculate the speed profile of trucks with any given weight/power ratio and for any given vertical alignment. This design tool will improve the ability to calculate critical length of grades for any situation.

Revue / Journal Title

Transportation research record    ISSN  0361-1981   CODEN TRREDM 

Source / Source

2004, no 1881 (86 p.)  [Document : 10 p.] (6 ref.), [Notes: Many of these papers were presented at the TRB 83rd Annual Meeting in January 2004], pp. 36-45 [10 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

National Research Council, Washington, DC, ETATS-UNIS  (1974) (Revue)

Mots-clés anglais / English Keywords

America

;

North America

;

Power

;

Weight

;

Speed

;

United States

;

Construction parameter

;

Data gathering

;

Heavy truck

;

Traffic flow

;

Performance evaluation

;

Geometry

;

Aligning (siting)

;

Structural design

;

Design

;

Road construction

;

Mots-clés français / French Keywords

Amérique

;

Amérique du Nord

;

Puissance

;

Poids

;

Vitesse déplacement

;

Etats Unis

;

Caractéristique construction

;

Collecte donnée

;

Poids lourd

;

Ecoulement trafic

;

Evaluation performance

;

Géométrie

;

Tracé alignement

;

Calcul construction

;

Conception

;

Construction routière

;

Mots-clés espagnols / Spanish Keywords

America

;

America del norte

;

Potencia

;

Peso

;

Velocidad desplazamiento

;

Estados Unidos

;

Característica construcción

;

Recolección dato

;

Peso pesado

;

Flujo tráfico

;

Evaluación prestación

;

Geometría

;

Trazado alineamiento

;

Cálculo construcción

;

Diseño

;

Construcción carretera

;

Localisation / Location

INIST-CNRS, Cote INIST : 10459 B, 35400012650918.0050

Nº notice refdoc (ud4) : 16461665



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