Lane Utilization at Two-Lane Arterial Approaches to Double Crossover Diamond Interchanges

2014 ◽  
Vol 2461 (1) ◽  
pp. 103-112 ◽  
Author(s):  
Chunho Yeom ◽  
Bastian J. Schroeder ◽  
Christopher Cunningham ◽  
Christopher Vaughan ◽  
Nagui M. Rouphail ◽  
...  
Keyword(s):  
Double Crossover ◽  
Diamond Interchanges ◽  
Lane Utilization

Lane Utilization Model Development for Diverging Diamond Interchanges

2017 ◽  
Vol 2618 (1) ◽  
pp. 27-37
Author(s):  
Chunho Yeom ◽  
Bastian J. Schroeder ◽  
Christopher Cunningham ◽  
Katy Salamati ◽  
Nagui M. Rouphail
Keyword(s):  
United States ◽  
Field Data ◽  
Model Development ◽  
The United States ◽  
Highway Capacity ◽  
Double Crossover ◽  
Highway Capacity Manual ◽  
Diamond Interchanges ◽  
Lane Utilization ◽  
Analysis Models

The diverging diamond interchange (DDI), also known as the double crossover diamond interchange, has been a successful, if unconventional, solution used in many parts of the United States ever since its first installation in Springfield, Missouri, in June 2009. One of the challenges to agencies in planning and operating DDIs is to apply to them methodologies developed for a conventional diamond interchange. The Highway Capacity Manual 2010 (HCM 2010) provides lane use analysis models for various lane configurations. However, there is no guarantee that these models will work for DDIs. For this reason, 11 DDIs were studied nationwide ( a) to examine whether the current HCM lane use models provided accurate results for DDIs and ( b) to develop new lane use models for them if the HCM models did not work. As a result of the study, unique multiregime lane utilization models were proposed, separated by the number of approach lanes and validated by field data not used in the model development.

Control Delay Calculation at Diverging Diamond Interchanges

2011 ◽  
Vol 2257 (1) ◽  
pp. 121-130 ◽  
Author(s):  
Hao Xu ◽  
Hongchao Liu ◽  
Zong Tian ◽  
Weihua Zhang
Keyword(s):  
Control Delay ◽  
Diamond Interchanges

New Intersection Crash Prediction Models for the Second Edition of the Highway Safety Manual

2021 ◽  
pp. 036119812110398
Author(s):  
Darren J. Torbic ◽  
Daniel Cook ◽  
Joseph Grotheer ◽  
Richard Porter ◽  
Jeffrey Gooch ◽  
...  
Keyword(s):  
Traffic Control ◽  
Prediction Models ◽  
Highway Safety ◽  
Crash Severity ◽  
Crash Prediction ◽  
Part C ◽  
Highway Safety Manual ◽  
Rural And Urban ◽  
Diamond Interchanges ◽  
Crash Prediction Models

The objective of this research was to develop new intersection crash prediction models for consideration in the second edition of the Highway Safety Manual (HSM), consistent with existing methods in HSM Part C and comprehensive in their ability to address a wide range of intersection configurations and traffic control types in rural and urban areas. The focus of the research was on developing safety performance functions (SPFs) for intersection configurations and traffic control types not currently addressed in HSM Part C. SPFs were developed for the following general intersection configurations and traffic control types: rural and urban all-way stop-controlled intersections; rural three-leg intersections with signal control; intersections on high-speed urban and suburban arterials (i.e., arterials with speed limits greater than or equal to 50 mph); urban five-leg intersections with signal control; three-leg intersections where the through movements make turning maneuvers at the intersections; crossroad ramp terminals at single-point diamond interchanges; and crossroad ramp terminals at tight diamond interchanges. Development of severity distribution functions (SDFs) for use in combination with SPFs to estimate crash severity as a function of geometric design elements and traffic control features was explored; but owing to challenges and inconsistencies in developing and interpreting the SDFs, it was recommended for the second edition of the HSM that crash severity for the new intersection configurations and traffic control types be addressed in a manner consistent with existing methods in Chapters 10, 11, and 12 of the first edition, without use of SDFs.

Program for Optimizing Diamond Interchanges in Oversaturated Conditions

2002 ◽  
Vol 1811 (1) ◽  
pp. 166-176 ◽  
Author(s):  
Vijay G. Kovvali ◽  
Carroll J. Messer ◽  
Nadeem A. Chaudhary ◽  
Chi-Leung Chu
Keyword(s):  
Diamond Interchanges

Modeling the Risk of Wrong-Way Driving Entry at the Exit Ramp Terminals of Full Diamond Interchanges

2018 ◽  
Vol 2672 (17) ◽  
pp. 35-47 ◽  
Author(s):  
Md Atiquzzaman ◽  
Huaguo Zhou
Keyword(s):  
Traffic Control ◽  
Initial Point ◽  
Geometric Design ◽  
Design Features ◽  
Entry Points ◽  
Control Devices ◽  
Traffic Control Devices ◽  
Diamond Interchanges ◽  
Transportation Agencies ◽  
Exit Ramp

Wrong-way driving (WWD) crashes are a critical safety issue on freeways. Although these crashes are rare and random in nature, they often result in severe injuries and/or fatalities. Typically, exit ramp terminals are the initial point of entry for wrong-way (WW) drivers on freeways. Therefore, it is important for transportation agencies to identify the exit ramp terminals with higher possibility of WW entries and apply safety countermeasures to reduce the chances of their occurrence. However, the random nature of WWD crashes and the difficulty in identifying the actual entry points makes it hard for transportation agencies to assess the risk of WWD at a particular exit ramp terminal and apply countermeasures accordingly. This study developed mathematical models for predicting the risk of WW entries at the exit ramp terminals of full diamond interchanges. The geometric design features, usage of traffic control devices, area type where the interchanges are located, and annual average daily traffic (AADT) at the exit ramp terminals with or without history of WWD were used as potential predictors of WW entry. Transportation agencies can use these models to assess the risk of WW entries at the exit ramp terminals within their jurisdictions and consider possible countermeasures. They also can be applied during the design phase to determine the combination of geometric design features and traffic control devices that ensures the least possibility of WW entry.

scholarly journals Hybrid DNA/RNA nanostructures with 2′-5′ linkages

Nanoscale ◽  
2020 ◽  
Vol 12 (42) ◽  
pp. 21583-21590
Author(s):  
Arun Richard Chandrasekaran ◽  
Johnsi Mathivanan ◽  
Parisa Ebrahimi ◽  
Javier Vilcapoma ◽  
Alan A. Chen ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Double Crossover ◽  
Hybrid Dna

We report here the first instance of nucleic acid nanostructures that contain 2′-5′ linkages and characterize structures of different complexities: a simple duplex to a 4-arm junction, a double crossover (DX) motif and a tensegrity triangle motif.

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