01517570

Component

A diverging diamond interchange (DDI), also called a double crossover diamond interchange (DCD), is a relatively new interchange type in the U.S. Due to its many advantages over the conventional diamond interchanges such as higher capacity and lower delay, there has been a growing interest in its analysis methodologies and operational strategies. DDIs have shown particularly high efficiency under conditions with heavy ramp traffic to arterial roads. However, as the DDI concept is relatively new in the U.S., the research on DDIs is still considered to be in the preliminary stage. In particular, most studies found in the literature only provided basic phasing schemes, which were not optimized for efficiency. Furthermore, there is a lack of commonly acceptable methodologies for obtaining critical signal control parameters, such as the cycle length, and phasing splits. Therefore, it is an area topic in need of much research in order to develop signal phasing schemes for achieving the optimized DDI performance. This study proposed a new methodology for signal phasing scheme design at DDIs. With minor adjustment, it can be applied to a variety of DDIs with different traffic demands and geometric configurations. The proposed phasing design approach was specifically designed for DDIs, so it could be employed as a guide or a reference for signal timing design at DDIs. At the DDI of Moana Ln and U.S. 395 in Reno, Nevada, the proposed scheme was evaluated and compared with various signal phasing schemes by using the hardware-in-the-loop simulation technology. The simulation results indicated that the proposed approach significantly outperformed the one currently being used at this interchange.

This paper was sponsored by TRB committee AHB25 Traffic Signal Systems.

01503729

14-1875

English

16p

2014

Transportation Research Board 93rd Annual Meeting

Digital/other

Figures; References; Tables

Diamond interchanges; Methodology; Traffic signal control systems; Traffic signal cycle; Traffic signal phases; Traffic simulation

VISSIM (Computer model)

Reno (Nevada)

Data and Information Technology; Highways; Operations and Traffic Management; I72: Traffic and Transport Planning; I73: Traffic Control

Transportation Research Board Annual Meeting 2014 Paper #14-1875

PRP, TRIS, TRB, ATRI

Jan 27 2014 2:40PM