00966544

Component

https://doi.org/10.3141/1847-05

http://scholar.google.com...ight&publication_year=2003

Many state and local transportation agencies have considered using U-turns as alternatives to direct left turns from driveways or side streets. Median designs are used that prohibit left turns onto the facility and midblock U-turn median openings to accommodate diverted left turns from side streets or driveways. The location of these U-turn median openings has a great impact on the operations of U-turns. Traffic operations (weaving and delay) for right turns followed by U-turn movements on urban or suburban multilane roadways were analyzed. A working model was developed to guide the location of U-turn median openings by minimizing the average delay for U-turn movements. A case study demonstrates the operational and safety benefits of optimal U-turn median opening location.

This paper appears in Transportation Research Record No. 1847, Operational Effects of Geometrics 2003.

English

p. 36-41

2003

Transportation Research Record

0309085837

Figures (3) ; References (10) ; Tables (5)

Case studies; Driveways; Location; Median openings; Multilane highways; Right turns; Traffic delays; Traffic safety; U turns; Weaving traffic

Diverted left turns; Side streets

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Dec 8 2003 12:00AM

• COMPARISON OF OPERATIONS OF SINGLE-POINT AND TIGHT URBAN DIAMOND INTERCHANGES
• COMPARISON OF THE NEW W-INTERCHANGE WITH CONVENTIONAL INTERCHANGES
• DETERMINATION OF STORAGE LENGTHS OF LEFT-TURN LANES AT UNSIGNALIZED INTERSECTIONS USING M/G2/1 QUEUING
• DEVELOPMENT OF DESIGN VEHICLES FOR HANG-UP PROBLEM
• EFFECTS ON ROAD SAFETY OF CONVERTING INTERSECTIONS TO ROUNDABOUTS: REVIEW OF EVIDENCE FROM NON-U.S. STUDIES
• SPEED DIFFERENTIAL AS A MEASURE TO EVALUATE THE NEED FOR RIGHT-TURN DECELERATION LANES AT UNSIGNALIZED INTERSECTIONS
• TRAFFIC PLANNING MODELS FOR SINGLE-POINT AND TIGHT DIAMOND INTERCHANGES