01628139

Component

https://doi.org/10.3141/2615-17

Procedures detailed in the Highway Capacity Manual 2010 (HCM 2010) estimate capacity and several operational measures dictating level of service for freeway facilities and surface streets. However, these methods do not consider cases in which spillback occurs from one facility type to another. The queuing effects in oversaturated conditions as they propagate upstream onto a freeway main line or a surface street intersection are not accounted for. The objective of this paper is to propose a series of modifications to enhance the HCM 2010 methods to address spillback conditions. These modifications consider lane utilization and lane blockage under spillback conditions and consist of restructuring existing equations and reference tables as well as developing new procedures. A four-regime method is proposed for evaluating spillback effects from urban streets to diverge and weaving segments. In addition, a method is proposed to account for the spillback effects from freeway on-ramps by reducing the effective green time as a proportion of the percent of time that the queue is expected to block the upstream signalized intersection. The framework developed uses assumptions that should be further explored through an extensive, nationwide data collection effort.

01628078

17-02572

English

pp 148–158

2017

Transportation Research Record: Journal of the Transportation Research Board

9780309442040

Digital/other

Figures (5) ; References (9) ; Tables (3)

Evaluation; Highway capacity; On ramps; Signalized intersections; Traffic congestion; Traffic flow; Urban highways

Highway Capacity Manual

Spillback effects (Traffic)

Highways; Operations and Traffic Management; Planning and Forecasting

PRP, TRIS, TRB, ATRI

Dec 8 2016 10:58AM

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• Calibrating Vissim to Analyze Delay at Signalized Intersections
• Car Drivers’ Experienced Level of Service on Freeways
• Estimating the Effects of Urban Street Incidents on Capacity
• Estimation of Saturation Headway in Work Zones on Urban Streets
• Evaluation and Testing of Driver-Assistive Truck Platooning: Phase 2 Final Results
• How Weather Events Affect Freeway Demand Patterns
• Influence of Remotely Operated Stop–Slow Controls on Driver Behavior in Work Zones
• Measuring Performance on Two-Lane Highways: Empirical Investigation
• Modeling Pedestrian Delays at Signalized Intersections as a Function of Crossing Directions and Moving Paths
• Naturalistic Study of Truck Following Behavior
• Novel Area Occupancy–Based Method for Passenger Car Unit Estimation on Multilane Urban Roads Under Heterogeneous Traffic Scenario
• Operational Analysis of a Single-Lane Roundabout with a Mix of Driverless Vehicles
• Optimizing and Modeling Tollway Operations Using Microsimulation: Case Study Sanand Toll Plaza, Ahmedabad, Gujarat, India
• Preparing Oregon for Connected Vehicle Deployment: Application Prioritization Process
• Queue Length at Signalized Intersections from Red-Time Formula and the Highway Capacity Manual Compared with Field Data
• Relationship Between Cycle Overflow Probability and Capacity at Signalized Intersections: Application for Delay Estimation