Traffic Simulation & Analysis

TQC will approach all projects with the goal of analyzing and improving the existing traffic signal system while working to assess and improve overall safety. TQCs knowledge, approach and experience in Traffic Simulation and Analysis are highlighted herein.

Traffic Simulations – Simulation and Modeling is initiated with data collection but is refined through calibration. TQC applies data calibration to refine simulation models and assure simulated conditions reflect operational conditions. TQC completes data calibration in the field and using video recorded traffic conditions to establish project specific traffic flow characteristics. Calibration techniques utilized may include, but not be limited to, Determining Site Specific Saturation Flow Rates, Conducting Spot Speed Studies, Observing Intersection Queue Lengths (Storage Ratio), Determining Lane Distribution for shared lane-groups, conducting spot speed, Identifying Traffic Generators/Access points between Intersections and Traffic Flow Balancing.

Timing & Optimization– The TQC Team will analyze signal timing patterns using all available features at our disposal. TQC staff has used a combination of modeling software and arterial travel time study software (Tru-Traffic) to develop, implement, and fine-tune system timing patterns in past projects. The review and development of new timings includes the Review of Clearance Calculations; Signal Phasing Review (Lead/Lag or Permitted/Protected Operations); Review/Develop Zoning (Speed Limits/85th Percentile Speeds, Signal Spacing and ADT); and Optimization/Coordination (Cycle Lengths, Splits, Offsets, and Time-Space Diagrams).

Analysis & Reporting – TQC reviews the project and works with clients to establish the required Performance Metrics at the outset of each project. Performance metrics are typically standard MOEs from the Highway Capacity Manual (HCM), Synchro Trafficware and Highway Capacity Software (HCS), such as LOS, delay, queue, and v/c ratio. However, TQC and our staff are experienced in developing and outputting performance measures populated by the Traffic Simulation and other software’s, including, but not limited to, the following: Total System Stops, Total System vehicle-hours of delay, Mean Travel Time, Average Speed, Travel Time Reliability and Buffer Time.


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