00634562

Component

http://onlinepubs.trb.org...trr/1993/1385/1385-006.pdf

https://scholar.google.co...isch&publication_year=1993

"Grade-separated intersections" refers to the various means of significantly increasing the capacity or resolving physical constraints by grade-separating the through movements on two intersecting roadways and interconnecting the two with ramps or roadways that form one or more intersections. Concepts and designs are discussed that have been successful in resolving intersection capacity problems and geometric or physical constraints in a manner responsive to the various needs and requirements of individual locations. Guidance is provided to the planner, designer, or traffic engineer in selecting the appropriate forms for a given condition. The 1990 AASHTO Policy discusses interchanges in Chapter X, but does not discuss adaptation of interchange forms to arterial (nonfreeway) situations. The categories of interchanges discussed include compact diamond, partial cloverleaf, and rotary forms. Each interchange type is described, and operational and design characteristics are discussed and compared with the others. The characteristics described, though generalized, reflect experiences gained through operational and design observation. All the interchanges presented are good forms when implemented under the site conditions that fit the specific design.

This paper appears in Transportation Research Record No. 1385, Intersection and Interchange Design. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01403217

English

p. 48-50

1993

Transportation Research Record

0309054567

Figures (3) ; References (1)

Alternatives analysis; Cloverleaf interchanges; Design; Grade separations; Highway capacity; Highway design; Interchanges; Interchanges and intersections; Intersections; Operations

Design features; Intersection capacity; Partial cloverleaf interchanges

Administration and Management; Design; Highways; Planning and Forecasting; I21: Planning of Transport Infrastructure

TRIS, TRB, ATRI

Aug 30 1993 12:00AM

• ACCESS CONTROL ISSUES RELATED TO URBAN ARTERIAL INTERSECTION DESIGN
• ACCIDENTS AND SAFETY ASSOCIATED WITH INTERCHANGES
• COMPARISON OF SIGHT DISTANCE PROCEDURES FOR TURNING VEHICLES FROM A STOP-CONTROLLED APPROACH
• COORDINATION OF BASIC INTERSECTION DESIGN ELEMENTS: AN OVERVIEW
• DESIGN OF INTERCHANGE AT-GRADE RAMP TERMINALS
• FREEWAY AND INTERCHANGE DESIGN: A HISTORICAL PERSPECTIVE
• GEOMETRIC DESIGN FEATURES OF SINGLE-POINT URBAN INTERCHANGES
• GEOMETRIC DESIGN OF METERED ENTRANCE AND HIGH-OCCUPANCY VEHICLE BYPASS RAMPS
• HUMAN FACTORS ASSOCIATED WITH INTERCHANGE DESIGN FEATURES
• INTERCHANGE PLANNING AND DESIGN--AN INTERNATIONAL PERSPECTIVE
• INTERCHANGE RAMP GEOMETRICS--ALIGNMENT AND SUPERELEVATION DESIGN
• INTERCHANGE STUDY AND SELECTION PROCESS
• INTERSECTION DESIGN CONSIDERATIONS TO ACCOMMODATE LARGE TRUCKS
• LENGTHS OF LEFT-TURN LANES AT SIGNALIZED INTERSECTIONS
• OPERATIONAL CONSIDERATIONS FOR SYSTEMS OF INTERCHANGES
• RAMP EXIT/ENTRANCE DESIGN--TAPER VERSUS PARALLEL AND CRITICAL DIMENSIONS
• RAMP/MAINLINE SPEED RELATIONSHIPS AND DESIGN CONSIDERATIONS
• SAFE ACCOMMODATION OF PEDESTRIANS AT INTERSECTIONS
• SAFETY IMPROVEMENTS AT INTERSECTIONS ON RURAL EXPRESSWAYS: A SURVEY OF STATE DEPARTMENTS OF TRANSPORTATION
• TWO-LANE LOOP RAMPS: OPERATION AND DESIGN CONSIDERATIONS