HCM 6th Edition Planning and Preliminary Engineering Applications Guide (PPEAG) to the HCM Bringing Back-of-the-Envelope Back.

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1 HCM 6th Edition Planning and Preliminary Engineering Applications Guide (PPEAG) to the HCM Bringing Back-of-the-Envelope Back April, 2017

2 Potential Use of the HCM in Planning The HCM is commonly used to evaluate current or forecast roadway operations The HCM can also reliably and cost-effectively support: Planning efforts Programming decisions Performance monitoring Roadway management 2

3 Actual Use of the HCM in Planning State DOTs, MPOs, local governments, and others were surveyed Less-experienced users less likely than expert users to see value in using the HCM for planning More use with short-term than long-term planning 3

4 Users Desired HCM Improvements for Planning Develop a P&PE Applications Guide (77%) Provide travel time reliability measures (63%) Extend HCM to system & corridor analyses (63%) Integrate HCM methods better with travel demand models (60%) Provide systemwide MOEs (60%) 4

5 Audiences for the Guide Regular HCM users Planning or preliminary engineering level analyses with limited available data Questions requiring a quick, reasonable answer Planners who may not be aware of the HCM or consider themselves HCM users, but who can nevertheless use it for portions of their work Coordinated use of the HCM with planning models and tools Integration of HCM methods and defaults into planning tools System performance monitoring 5

6 Focus of the Guide Multifacility Single facility, point 6

7 Guide Outline Part 1: Overview Gateway to the Guide for non-hcm users Information cross-referenced throughout the Guide Part 2: Medium-Level Analysis Gateway to the Guide for current HCM users Planning tools for HCM system elements (points, segments, facilities) Part 3: High-Level Analysis Guidance on extending the HCM to corridors, areas, and transportation systems Part 4: Case Studies 7

8 Organization of the Guide Part 2: Medium-Level Analysis (Sections H P) Entry point to the guide for HCM users HCM 6th Edition refers readers to specific guidebook sections Organized by HCM system element Freeways, two-lane highways, urban streets, etc. Plus bicycles, pedestrians, transit, and truck (freight) modes Typical subsections Scoping and screening method HCM method with defaults Alternate or extended HCM method

9 Part 2 Outline H. Freeway Analyses I. Multilane Highways J. Two-Lane Highways K. Urban Streets L. Signalized Intersections M. STOP-Controlled Intersections N. Roundabouts O. Pedestrians, Bicyclists, and Public Transit P. Truck Level of Service 9

10 Simplified HCM Method Most HCM operations methods require specialized software to implement Many target users of the Guide won t have access to this software Using the HCM method with defaults may require more resources than available or appropriate for the analysis The Guide presents simplified methods that are HCM-compatible, but can be performed by hand or implemented in a basic spreadsheet Multiple performance measures can be calculated Simplified methods available for all system elements 10

11 Example Data Requirements for the Simplified Signalized Intersection Method Performance Measure Input Data (units) Cap Del LOS MMLOS Que Default Value Number of turn lanes Must be provided Other geometry HCM Exhibit Signal timing HCM Exhibits and (total entering volume <1,000 Peak hour factor (decimal) veh/h), 0.92 (otherwise) Percentage heavy vehicles (%) 3% Parking activity None Pedestrian activity None Volumes by movement (veh/h) Must be provided Analysis period length (h) 0.25 h Cap = capacity, Del = delay, LOS = motorized vehicle level of service, MMLOS = multimodal level of service, Que = queue length 11

12 Section Analysis Using the HCM with Defaults Applies the HCM operations method, but using default values for many inputs to reduce data requirements Requires access to HCM-implementing software Guide provides information on what input data are needed to apply the method Guide suggests default values for inputs that can be defaulted Applicable system elements: Freeways, multilane highways, two-lane highways Urban streets 12

13 Other Topics: Sections H N Freeways Method adaptations for advanced freeway management practices Urban streets Method extension to over-capacity conditions 13

14 Section P: Truck Level of Service The HCM doesn t provide a truck LOS measure NCFRP Report 31 does, and it has been incorporated into the Guide Truck LOS is based on the degree to which a roadway provides ideal truck conditions Usable by trucks with legal size and weight loads No at-grade railroad crossings Provides reliable truck travel at truck free-flow speeds Low cost (i.e., no tolls) 14

15 Organization of the Guide Part 3: High-Level Analysis (Sections Q S) Extensions of the HCM to larger study areas Corridors Areas and systems Systemwide performance monitoring

16 Scoping and Screening Applying generalized service volume tables Developing service volumes Applicable system elements: Freeways Multilane highways Two-lane highways Urban streets Peak-Hour Peak-Direction (veh/h/ln) AADT (2-way veh/day/ln) Area LOS E LOS E Type Terrain LOS A-C LOS D (capacity) LOS A-C LOS D (capacity) Urban Level 1,550 1,890 2,150 14,400 17,500 19,900 Urban Rolling 1,480 1,810 2,050 13,700 16,700 19,000 Rural Level 1,460 1,770 2,010 12,100 14,800 16,800 Rural Rolling 1,310 1,600 1,820 11,000 13,400 15,200 16

17 Milwaukee CBD Signalized Intersection Hourly Service Volume Tables Roadway Type Undivided Roadway Two-way w/ Parking Two-way w/o Parking One-way w/ Parking (1 side) One-way w/ Parking (2 sides) One-way w/o Parking # of Lanes Service Volumes (per direction) A B C D E 1* *

18

19 Section Q: Corridor Quick Estimation Screenline Analysis Quick method for assessing corridor capacity More-detailed assessments would use Section R (area) techniques or facility-specific methods from Part 2 19

20 Section R: Areas and Systems Area- and systemwide analysis is typically performed in a travel demand modeling environment Section R provides guidance on: Using HCM procedures to generate the key performance analysis inputs required by typical demand models Post-processing demand model output to generate additional performance measures 20

21 Florida DOT Section S: Roadway System Monitoring Guidance on identifying and diagnosing travel-time reliability and capacity problems Method assumes that the agency has access to archived average travel times by road segment and time of day The travel time index, the ratio of actual to free-flow travel time, is a useful indicator of congestion problem spots 21

22 Case Studies Part 4: Case Studies (Sections T V) In-depth examples of applying the Guide s methods Freeway master plan Arterial bus rapid transit analysis Long-range transportation plan

23 HCMAG Outreach The Guide can be downloaded from HCM Volume 4 Free, one-time registration required Five spreadsheet computational engines provided on Volume 4 to help implement some of the Guide s methods Upcoming HCMAG Webinars Sponsored by TRB Planning and Preliminary Engineering Applications Guide to the Highway Capacity Manual: Part 1, Contents (May 30, 2017) Planning and Preliminary Engineering Applications Guide to the Highway Capacity Manual: Part 2, Applications (June 28, 2017) 23

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