Maryland Unconventional Intersection Design Analysis Tool

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Presentation transcript:

Maryland Unconventional Intersection Design Analysis Tool MUID Maryland Unconventional Intersection Design Analysis Tool

Maryland Unconventional Intersection Design (MUID) Analysis Tool INTRODUCTION Maryland Unconventional Intersection Design (MUID) Analysis Tool Developed by University of Maryland, College Park and MDSHA A tool to conduct a capacity/ queuing analysis as well as signal optimization for continuous flow intersection (CFI), diverging diamond interchange (DDI), and superstreet intersection Intersections/Interchanges Copyright ©2004-2014 ATTAP. All rights reserved.

MODULES Planning Evaluation Module Signal Optimization Module Queue length Average Delay Critical Lane Volumes (CLVs) Signal Optimization Module Offset Cycle length g/C ratio In the planning evaluation module, add “Queue/link ratio” In the signal optimization module, may be “green split” is better than g/C ratio Another module is output module, which shows input parameters, planning evaluation results and signal optimization results Copyright ©2004-2014 ATTAP. All rights reserved.

PLANNING EVALUATION MODULE Planning Evaluation Procedure Identifying all factors contributing to the total delay and queue, including external factors such as demand, and internal factors such as intersection geometric features Generating a comprehensive data set with all identified factors for simulating analysis Build simulation models using VISSIM and Calibrate VISSIM parameters with field data Random sampling of different demand scenarios Deriving the quantitative relationships between intersection delays and contributing factors Estimating the impact of queues on the overall intersection performance and developing a set of statistical models for queues length prediction at each critical location In the third stage, Intersection delays -> performance measures Copyright ©2004-2014 ATTAP. All rights reserved.

PLANNING EVALUATION MODULE Planning Evaluation Results Copyright ©2004-2014 ATTAP. All rights reserved.

SIGNAL OPTIMIZATION MODULE Signal optimization Procedure 1 Calculate the CLV of each sub-intersection according to the phasing designs 2 Determine the common cycle length based on the CLV of the most congested sub-intersection 3 For each sub-intersection, optimize the green ratio of each phase with the objective of maximizing the capacity of intersection 4 Determine the critical traffic paths according to the demand pattern 5 Use a modified MAXBAND model to provide progressions to those critical traffic paths so as to optimize the offsets Copyright ©2004-2014 ATTAP. All rights reserved.

SIGNAL OPTIMIZATION MODULE Signal Optimization Results Can you show two functions below? The synchronized movements are listed on the top left corner The user may change the green time and then the graph will update automatically, as well as the average delay I have attached one slide at the end to somehow show the issues. Copyright ©2004-2014 ATTAP. All rights reserved.

INTERSECTION/INTERCHANGE DESIGNS Cover different intersection/interchange designs Continuous Flow Intersection CFI-T Partial CFI(symmetrical) Partial CFI(asymmetrical) Full CFI Diverging Diamond Interchange Superstreet Intersection Copyright ©2004-2014 ATTAP. All rights reserved.

INPUT DEMAND User-friendly Interface Manually input demand or Generate random demand Copyright ©2004-2014 ATTAP. All rights reserved.

INPUT GEOMETRIC CHARACTERISTICS User-friendly Interface Manually input geometric information or Generate random demand Generate random demand -> adopt the default geometry setting I think this interface is user friendly mainly because the link will be colored if the corresponding textbox is being selected. Can you show this in the slides.? I have attached one page at the end of this file showing this advantage. It is from the slides for the Utah conference. Copyright ©2004-2014 ATTAP. All rights reserved.

OUTPUT Show demand Copyright ©2004-2014 ATTAP. All rights reserved.

OUTPUT Show link length Copyright ©2004-2014 ATTAP. All rights reserved.

OUTPUT Show phase plan Copyright ©2004-2014 ATTAP. All rights reserved.

OUTPUT Show Queue length Copyright ©2004-2014 ATTAP. All rights reserved.

OUTPUT Show Queue/Link length ratio Copyright ©2004-2014 ATTAP. All rights reserved.

OUTPUT Show signal timing(s) Copyright ©2004-2014 ATTAP. All rights reserved.

OUTPUT Generate a report with input and module output Generate a comprehensive report containing all the input and output of the intersection Copyright ©2004-2014 ATTAP. All rights reserved.

Step 5: Signal Optimization Optimization for cycle length, green split and offset 11/13/2018

Step 3: Edit Geometric Parameters Change # of lanes and link Length The selected link will be colored for convenience 11/13/2018