01154417

Component

The Diverging Diamond Interchange (DDI) can be a very attractive interchange option due to its efficient design that improves traffic flow and reduces conflict points at relatively low costs. A better understanding on how the DDI works could improve traffic operations and help in design criteria. This paper will introduce theories on how the DDI works by examining the signal progressions both within the interchange and outside of the interchange. The paper will explain how a better understanding of this theory can provide guidance to designers for decisions on crossover speed and location. The theories will also show how traffic engineers can make better decisions in choosing cycle lengths for the DDI and the adjacent signal system. Additionally, this paper will introduce a DDI that allows thru movements for the ramp traffic based on the better understanding of the signal progressions that this paper presents.

01147878

10-1605

English

15p

2010

Transportation Research Board 89th Annual Meeting

DVD

Figures (10) ; References (7)

Diamond interchanges; Highway design; Highway operations; Through traffic; Traffic engineering; Traffic signal control systems; Traffic signal cycle

Diverging diamond interchanges

Highways; Operations and Traffic Management; I72: Traffic and Transport Planning

Transportation Research Board Annual Meeting 2010 Paper #10-1605

TRIS, TRB

Jan 25 2010 10:42AM