Control Delay Calculation at Diverging Diamond Interchanges

Xu, Hao; Liu, Hongchao; Tian, Zong; Zhang, Weihua

doi:10.3141/2257-14

Cited by 11 publications

(16 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Efficient signaling and proper traffic flow analyses are important subjects to determine which variables influence DDI's operational performance [7], [8] Several researchers have developed procedures to optimize the traffic signal design for DDIs; considering variables such as green splits, geometric designs, traffic volumes, and phasing plans, among others. These variables, depending on the DDI's properties, are incorporated into the algorithms developed to maximize intersection capacity and improve safety at the intersection for all users.…”

Section: B Signaling and Trafficmentioning

confidence: 99%

See 1 more Smart Citation

Framework for Considering a Diverging Diamond Interchange to Improve Operations and Safety

Diaz¹,

Rios²,

Medina³

et al. 2019

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation

View full text Add to dashboard Cite

Innovations on intersection design have been the focus of recent developments in the US and around the world. The second installment of the Every Day Counts initiative (EDC-2) from the Federal Highway Administration (FHWA) promoted five new intersection designs. One of them was the Diverging Diamond Interchange (DDI). This innovative design has been implemented in several cities in the US to improve operations and safety. Puerto Rico is currently building its first DDI in the intersection of an arterial street and a freeway in the Municipality of Gurabo. This paper discusses the main characteristics of the DDI and presents a design framework from conception to implementation. This framework considers the geometric, environmental, and cultural influence in the design of a DDI, while also paying attention to the influence of non-motorized users and the continuous evaluation of the intersection by using driving simulation as part of the effective project implementation. Other topics discussed include safety evaluation, signaling, traffic influence, and the use of driving simulation into the determination of operational safety at a DDI. Also, the comparison between the conventional diamond interchange and the DDI, potential DDI issues from an operational point of view, and the objectives or goals of this type of intersection design are presented. A discussion of the benefits of using a driving simulator as a tool to evaluate a DDI and the importance of the data gathered in the process are also explained. Details of the implementation of this framework in Puerto Rico are presented as concluding remarks.

show abstract

Section: B Signaling and Trafficmentioning

confidence: 99%

“…-DDIs' design is able to combine left-turning traffic with through traffic. This eliminates the left turn-only signal phase of a CDI and reduces delays at the intersection [7].…”

Section: Diverging Diamond Interchange Vs Conventional Diamond Imentioning

confidence: 99%

Framework for Considering a Diverging Diamond Interchange to Improve Operations and Safety

Diaz¹,

Rios²,

Medina³

et al. 2019

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation

View full text Add to dashboard Cite

show abstract

“…The evaluation assessed traffic operations, safet y, and public perceptions. Other researchers have been studying various aspects of DDI including construction, operation and application (Xu et al, 2011;Chlewicki, 2011). Anderson et al (2011) have developed an initial Process-Model of the Diverging Diamond Interchange.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Simulation methods are advantageous in conducting "what if" studies and testing the scenarios and phenomena that may not occur or are hard to capture in the field (Xu et al, 2011). Because of these major advantages, simulation has become an essential tool in traffic operational analysis (Jones et al, 2004).…”

Section: Simulation Toolmentioning

confidence: 99%

Evaluating the Application of Diverging Diamond Interchange in Athens, Alabama

Khan

Anderson²

2016

IJTTE

View full text Add to dashboard Cite

A diverging diamond interchange (DDI), a freeway and arterial interchange design, uses crossovers at the ramp intersections to eliminate conflicts between arterial through traffic and the left turning traffic from both the arterial and the ramps. The conventional diamond interchange (CDI) compared with the DDI has similar on-ramps and off-ramps, but there is a change in the number of lanes on the arterial. A case study has been conducted for an interchange in Athens, Alabama. The existing interchange is a conventional diamond interchange which is compared with a DDI built at the same location by using Synchro/ Simtraffic as a simulation tool. The analysis focused on determining level of service and vehicle delay for the two interchange types. In this project effort was made to know if a DDI is the right solution for all interchange locations through the examination of a single location and adjustments to traffic volumes under numerous combination of turning movement scenarios where variation of capacity and the influence of proximity of adjacent intersections were also included. Finally, it was concluded that DDI cannot be an appropriate measure to improve the current CDI network for the study area since only 4 special cases it performs better than CDI. And DDI cannot be the effective traffic calming measure if it is associated with upstream or downstream intersections.

show abstract

“…To investigate the strengths and deficiencies of DDI, Hughes et al (2010) and Chang et al (2011) conducted extensive performance comparisons between DDI and conventional interchanges. Also, considering the possible internal queue spillback, Xu et al (2011) developed an analytical method to estimate the control delay of a DDI on its internal and external movements.…”

Section: Introductionmentioning

confidence: 99%

Development of a Signal Optimization Model for Diverging Diamond Interchange

2014

View full text Add to dashboard Cite

As one of the most popular unconventional interchange designs, diverging diamond intersection (DDI) has received increased attention over the past decade. Through a reverse operation of traffic movements between its two crossover intersections, DDI can accommodate more traffic movements within each phase. To design an effective signal plan for DDIs, one needs to address the following two critical issues: (1) how to select the common cycle length and green splits at each crossover intersection under different geometric conditions, and (2) how to coordinate a DDI's two crossover intersections with its adjacent conventional intersections. To contend with these issues, this paper presents an optimization model with the objective of maximizing intersection capacity to yield the optimal green splits and cycle length. Also, in view of the potentially large left-turn traffic volumes from the freeway off-ramps, this study has further modified a model to provide progressions to both left-turn and through traffic paths. Using simulation software as an unbiased tool, this study has conducted extensive simulation comparisons between the optimized signal plans and the results from signal optimization software under various traffic scenarios. The experimental results confirm the promising properties of the proposed signal models for DDI, especially if the traffic progression between two crossover intersections is the major concern.

show abstract

Control Delay Calculation at Diverging Diamond Interchanges

Cited by 11 publications

References 4 publications

Framework for Considering a Diverging Diamond Interchange to Improve Operations and Safety

Framework for Considering a Diverging Diamond Interchange to Improve Operations and Safety

Evaluating the Application of Diverging Diamond Interchange in Athens, Alabama

Development of a Signal Optimization Model for Diverging Diamond Interchange

Contact Info

Product

Resources

About