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Title:

The Evaluation of Design Consistency: Predicting Models of Operating Speed on Three-Dimensional Alignment from Tests on Driving Simulator

Accession Number:

01004425

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

The evaluation of geometric design consistency implies the preliminary estimation of operating speeds (V85s), for which a number of predicting models can be found in literature, based on characteristics of the horizontal alignment and neglecting potential effects of the vertical alignment characteristics. In this respect, the author carried out an experimental survey using the interactive static base driving simulator of the Interuniversity Research Center on Road Safety in order to evaluate how horizontal alignment and profile affect speed. Two two-lane rural roads were designed and implemented in the driving simulator. They are characterized by the same horizontal alignment but different vertical alignments: one is completely flat while the other has a profile with longitudinal grades ranging between +/- 6%. Collected data analysis during the simulation tests highlighted that: on the elements of the road with grades different than zero the V85s are different from those measured on the same elements of the flat road; V85 values measured on the road with longitudinal grades different than zero determine different evaluations from those determined by V85 measured on flat road on road safety, according to Safety Criterion II; the operating speed on each design element of the alignment is influenced also by the adjacent elements. According to the surveys carried out, here the author is proposing some V85 predicting models for curve sections and tangents. An assessment is required on the basis of further data from tests on the driving simulator on a wider sample of two-lane rural roads.

Monograph Accession #:

01004374

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Bella, Francesco

Pagination:

18p

Publication Date:

2005

Conference:

3rd International Symposium on Highway Geometric Design

Location: Chicago Illinois, United States
Date: 2005-6-29 to 2005-7-1
Sponsors: Transportation Research Board; American Association of State Highway and Transportation Officials (AASHTO); Federal Highway Administration; American Society of Civil Engineers; Association Mondiale de la Route; International Road Federation; Institute of Transportation Engineers (ITE); National Association of County Engineers; Transportation Association of Canada (TAC); Chicago Department of Transportation; Illinois Department of Transportation; Illinois State Toll Highway Authority

Media Type:

CD-ROM

Features:

Figures (6) ; References (18) ; Tables (1)

Subject Areas:

Design; Highways; I20: Design and Planning of Transport Infrastructure

Files:

TRIS, TRB, ATRI

Created Date:

Sep 27 2005 1:18PM