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The 2010 Highway Capacity Manual

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Presentation on theme: "The 2010 Highway Capacity Manual"— Presentation transcript:

1 The 2010 Highway Capacity Manual
Richard Dowling

2 The Highway Capacity Manual
4 Editions & 1 Update from 1950 to 2000 HCM 2000 24,500 copies distributed (14% metric) Another 500 copies for the 2011 PE Exam Most fervent readers: Students and software developers Everybody using traffic analysis software uses HCM

3 Major Changes for 2010 Guidance on Integrating Microsimulation and HCM
Multimodal (Complete Streets) LOS Analysis Software Active Traffic Management Partially Electronic Format New HCM 2010 Support Website

4 Presentation Outline Content, Format, Schedule, Software
Technical Innovations Uninterrupted flow facilities (freeways, rural highways) Interrupted flow facilities (urban streets, signals) Alternative Methods (microsimulation) Active Traffic Management

5 Format and Content - It won’t come entirely in printed form
- One part will come entirely in electronic form - Software: source code available to all - A website for extra materials

6 Organization of Manual
Volume 1 – Concepts Volume 2 – Uninterrupted Flow Facilities Freeways, rural highways, rural roads Volume 3 – Interrupted Flow Facilities Urban arterials, intersections, roundabouts Signals at freeway interchanges, Bicycle and Pedestrian paths Volume 4 – Supplemental Materials

7 Vol.1 – Concepts of Capacity
Target Audience: Managers, Students Nine chapters that cover….. Concepts Traffic flow, capacity, quality of service Modal characteristics Capacity Analysis Applications How to apply the HCM How and when to use microsimulation Interpretation and presentation of results

8 Vol. 2 – Uninterrupted Flow Facilities
Target Audience: technical people Six chapters on: Freeways and their component sections Basic sections, ramp merge/diverge, weaving Multi-lane rural highways Two-lane rural roads

9 Vol. 3 Interrupted Flow Facilities
Target Audience: Technical and professional people Eight chapters on: Urban arterials Signalized intersections Unsignalized intersections Roundabouts Signals at freeway interchanges Bike and pedestrian paths Multimodal Level of Service

10 Vol. 4 – Supplemental Materials
Target Audience: Engineers and programmers 12 chapters, all electronic, on the web More detailed descriptions of methods Worked example problems Annotated software source code Technical reference library HCM Application Guide New: Active Traffic Management

11 Software Software Will not compete with commercial software
Source code available to all Illustrates how to program the methods Can be used to verify commercial software Will not compete with commercial software Will have very limited user interface Will work only for simple and limited example problems

12 Website

13 Publication Schedule In TRB Production Publication December 2010

14 Technical Innovations
Uninterrupted Flow Facilities Interrupted Flow Facilities

15 Uninterrupted Flow Facilities
Technical Innovations New speed-flow equations New freeway analysis software New weaving method Service volume tables

16 Freeway Speed-Flow Curves
Free-Flow Speed No longer function of number of lanes Ramp density substituted for interchange density New curve for 75 mph free-flow speed Speed does not drop until 1200 vph/ln reached

17 Source: Draft HCM 2010 Materials, Kittelson & Associates

18 Weaving Sections Changes to Current Method New weaving section types
New method for estimating speed Weaving length dependent on demands. New method for estimating capacity

19 Freeway Facility Analysis
Modifications to reflect changes in other chapters New software implementation (FREEVAL) Updated capacity information for: Work Zones Weather (rain, snow, wind, visibility) Incidents

20 Analysis Over Time & Space
D/C SS 1 SS 2 SS 3 SS 4 SS 5 SS 6 16:00 0.68 0.75 0.72 0.80 0.73 16:30 0.85 0.82 0.93 17:00 0.87 0.97 0.90 1.03 17:30 0.98 18:00 0.78 0.70 18:30 0.58 0.62 0.60 MPH 63 62 61 60 58 57 59 29 41 19 15 35 27 48 64

21 FREEVAL Outputs (Speed)

22 Service Volume Tables Rural Freeway ADT’s (1000’s)

23 Multi-lane Highways Bicycle LOS analysis added Service volume tables

24 Two Lane Highways Two-way analysis methodology dropped.
Some revisions to curves and tables. New road class added for built-up areas. LOS based on % free-flow speed (FDOT) Bicycle LOS on two-lane highways. Service volume tables

25 Interrupted Flow Facilities
Technical Innovations: New multimodal level of service method New methods for arterials and signals New method for signals in an interchange New method for roundabouts

26 Multimodal Level of Service
Simultaneous analysis of LOS for auto drivers, bus riders, bicyclists, pedestrians. A method for allocating scarce street right-of-way to the various modal users of the street.

27 Sharing the Street – Complete Streets
Mode Before After Auto C D Bus B Bicycle F Pedestrian E Before After

28 Urban Street Analysis Predicts Stops (New), Speed, Queues
Models signal coordination force offs, yields Mixed street: signal, stops, roundabout Sensitive to access management driveways, median breaks Service Volume Table

29 Urban Street Service Volumes

30 Signalized Intersection Updates
Incremental queue analysis (IQA) Traffic actuated signals Min. green, passage time, recall, dual entry, Dallas phasing, simultaneous gap out, detector length. Left turn queue overflow check (New) Volume/capacity ratio check (New) Level of service for bicycles and pedestrians (New)

31 Incremental Queue Analysis
Delay polygon for shared left-through lane with permitted lefts Old New Queued Vehicles Time

32 Left Turn Overflow Check (New)
If left turn overflow occurs, review results

33 Volume/Capacity Ratio Check
if: v/c > 1.00 Then the signalized intersection LOS is “F”

34 Two-Way Stop Updates Extended to 6-lane arterials. U-turns
Analysis of shared lanes, short lanes Pedestrian crossings analysis

35 All Way Stop Updates Queuing model added
Explicit guidance for 6-lane streets

36 Roundabouts Update New methodology based on US Research
NCHRP Report 572 U.S. Capacities lower than rest of world LOS based on delay Same thresholds as for unsignalized intersections Roundabouts held to higher standard than signals

37 Roundabout Capacity Slide courtesy of:
Lee Rodegerdts, Kittelson & Associates

38 Capacity: 1 lane Slide courtesy of: Lee Rodegerdts, Kittelson & Associates

39 Capacity: 2x1 lane Slide courtesy of: Lee Rodegerdts, Kittelson & Associates

40 Capacity: 1x2 lane Slide courtesy of: Lee Rodegerdts, Kittelson & Associates

41 Capacity: 2x2 lane Slide courtesy of: Lee Rodegerdts, Kittelson & Associates

42 Interchange Ramp Terminals
Analysis of Diamonds, Par-clos, Roundabouts Methodology for choosing interchange types Lost capacity due to: Queue spillbacks Uneven lane utilization Demand starvation

43 Alternative Methods When and how to apply microsimulation.
Comparing microsimulation results to HCM results

44 Chapter 6: HCM and Alternative Tools
Planning Methods Based on the HCM Alternative Methods (Microsimulation) Traffic modeling concepts Application guide Framework to apply HCM + microsimulation Comparison of performance measures Selection of traffic models

45 Chapter 7 Interpreting Results
Uncertainty and Variability Concepts, Sources, Sensitivity Analysis Uncertainty and Sensitivity of HCM results Comparing HCM and Microsimulation Results Framework for comparing HCM/microsim results Specific guidance provided in facility specific chapters Presentation of HCM/Microsimulation Results Significant digits for reporting

46 Microsimulation vs HCM Delay
Accumulated Vehicles Arrivals HCM Delay Departures Modelos de micro-simulacion cuentan solo la demoras que se acumulan durante el periodo de análisis. Los métodos del manual de capacidad incluyen la demora extra que sufren los vehículos que quedan en la cola cuando termina el periodo de análisis. Queue Dissipation Time Time Analysis Period

47 Active Traffic Management
New chapter on the continuous real time monitoring and management of both demand and capacity Se trata del monitoreo continuo y el control dinámico del tránsito Ejemplos son….

48 Active Traffic Management
ATM is a comprehensive approach to optimizing the operational performance of the roadway system through monitoring and control of systems operations and demands. Examples Demand Metering, Congestion Pricing, Managed Lanes, Adaptive Control, Speed Harmonization, Traveler Information Systems, Incident Management, Work Zone Management

49 Active Traffic Management
Provides basic information on active traffic management measures Provides references from the literature Describes applicability of HCM or microsimulation methods to evaluation New methodology coming in one year

50 Conclusion – The New HCM
New tools for multimodal planning Guidance on the use of microsimulation New methods for freeways and streets Service volume tables for planning applications New material to aid software programmers Information on Active Traffic Management

51 Questions/Comments Richard Dowling Dowling Associates, Oakland, CA
ext 120 Pero antes Quiero agradecer a dos personas muy importantes en el desarrollo del Manual Mark Vandehey, el autor/editor en jefe del Manual Y Richard Cunard, de “transportation research board” que coordina la publicación del manual para 2010.

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