01366396

Component

https://doi.org/10.3141/2286-14

http://scholar.google.com...Wang&publication_year=2012

The building of managed lanes parallel to general purpose lanes is an increasingly common approach to optimizing freeway capacity. Managed lanes allow agencies to classify customers and assign a portion of the freeway capacity to them. With no methodology in the Highway Capacity Manual (HCM) for analyzing these facilities, analysts rely on more time-consuming simulation analyses. A methodology is presented for estimating the performance of a parallel system of general purpose and managed lane facilities in an HCM context based on NCHRP Project 3-96. The methodology defines new managed lane segment types to use in an HCM analytical framework and is associated with a new set of speed–flow curves. It is sensitive to the number of lanes and the type of separation between managed lanes and general purpose lanes. The method introduces the concept of parallel lane groups of general purpose and managed lanes and thus can account for speed reduction in managed lanes caused by congestion in adjacent general purpose lanes. The method was implemented in a computational engine, FREEVAL-ML, which was built on the freeway facilities method in HCM 2010 but which was updated to incorporate inputs and outputs of the managed lane components. The geometry of two existing managed lane facilities in Washington State is used to illustrate the method, demonstrating the applicability of the analytical framework to real-world facilities.

01450371

12-1667

English

pp 122–132

2012

Transportation Research Record: Journal of the Transportation Research Board

9780309223263

Print

Figures; References

Freeways; General purpose lanes; Highway capacity; Managed lanes; Methodology; Traffic congestion

FREEVAL (Computer program); Highway Capacity Manual 2010

Washington (State)

Highways; Operations and Traffic Management; I71: Traffic Theory; I73: Traffic Control

TRIS, TRB, ATRI

Feb 8 2012 5:04PM

• Calibration and Validation of Highway Capacity Manual 2010 Capacity Model for Single-Lane Roundabouts
• Effect of Inclement Weather on Two Capacity Flows at Recurring Freeway Bottlenecks
• Ensemble Tree Approach to Estimating Work Zone Capacity
• Equilibrium of Probabilities for Estimating Distribution Function of Critical Gaps at Unsignalized Intersections
• Estimating Right-Turn-on-Red Capacity for Dual Right-Turn Lanes at Signalized Intersections
• Estimation of Capacity Drop in Highway Merging Sections
• Evaluating the Effects of Signal Countdown Timers on Queue Discharge Characteristics at Signalized Intersections in China
• Evaluating the Operational Impact of Left-Turn Waiting Areas at Signalized Intersections in China
• Field Data for Evaluating 2010 Highway Capacity Manual Operational Analysis Methodology for Interchange Ramp Terminals
• Implementing Auxiliary Through Lanes in Context of Highway Capacity Analysis
• Models for Estimating Drivers Following on Two-Lane Rural Highways
• Operational Performance and Speed–Flow Relationships for Basic Managed Lane Segments
• Rationale for Incorporating Queue Discharge Flow into Highway Capacity Manual Procedure for Analysis of Freeway Facilities