Title: McTrans newsletter
Full Citation
Permanent Link: http://ufdc.ufl.edu/UF00078185/00034
 Material Information
Title: McTrans newsletter
Physical Description: Serial
Language: English
Creator: Center for Microcomputers in Transportation, College of Engineering, University of Florida
Publisher: Center for Microcomputers in Transportation, College of Engineering, University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: January 2009
 Record Information
Bibliographic ID: UF00078185
Volume ID: VID00034
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.


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2010 Highway Capacity Manual

2010 HCM Changes
Paul Ryus, P.E., Kittelson & Associates, Inc.

Production of the fifth edition of the Hi.h iv Capacity
Manual (HCM) is well underway, with over half of its
chapters approved for publication by the TRB Commit-
tee on Highway Capacity and Quality of Service
(HCQS) as of mid-December.

Users of the HCM2000 will find the new manual's look
-and-feel familiar, as a number of the stylistic elements
introduced in the HCM2000 have been retained in the
2010 HCM. At the same time, users will notice a num-
ber of changes in the manual. The most obvious of
these is that the 2010 HCM will be published as four
volumes-Concepts, Uninterrupted Flow, Interrupted
Flow, and Applications Guide-with the last volume
being published only electronically.

The 2010 HCM will have more of a multimodal focus
than ever before, with pedestrian, bicycle, and transit
material provided next to automobile material in many
chapters. (Transit material will be presented only in a
multimodal context; the 2010 HCM defers to the com-
panion Transit Capacity and Quality of Service Manual
for transit-specific methodologies.) The 2010 HCM also
recognizes the growing role of alternative analysis
tools, such as simulation, and devotes most of two con-
cepts chapters, as well as sections within most proce-
dural chapters, to that topic.

The four-volume format was necessitated by the more
than $5 million of funded research that has occurred
since 2000 through the National Cooperative Highway
Research Program (NCHRP) that needed to be incorpo-
rated into the HCM. In addition, two FHWA-sponsored
projects on shared-use paths and active traffic manage-
ment are contributing significant content to the 2010
HCM. The key methodological changes in the 2010
HCM are described on Page 2.

Highway Capacity SoftwareTM(HCS+)TM

Work on HCS+ to implement the updated procedures
coming in the 2010 HCM has been ongoing for over a
year. McTrans' goal is to be ready with the HCS+ up-
grade to coincide with 2010 HCM publication.

Most HCS+ modules will not change structurally, even
though the computations will be modified (some a little,
some a lot) to match the new HCM procedures. How-
ever, the Signalized Intersection and Urban Streets
modules have a significantly different program architec-
ture to take advantage of the latest programming tech-
niques. While this is necessary to implement these
complex procedures in an efficient structure, the "look
and feel" to the user will hopefully stay quite familiar.

Even though this is a major upgrade to HCS+, the sup-
port subscription will cover these changes and provide
this new version automatically without cost to all users
whose support is current at the time of release.

To honor the National Academies of Science (NAS),
the National Cooperative Highway Research Program
(NCHRP) and the Transportation Research Board
(TRB) ownership of this material, McTrans does not
plan to distribute software based on these new proce-
dures until the 2010 HCM has been published.


With this update to TSIS-CORSIM, McTrans will inte-
grate and include TRANSYT-7F in this package. All
licensed users with current support subscriptions will be
receiving this version automatically, on CD to accom-
modate the addition of TRANSYT-7F. The ability to
interchange files and provide signal timing optimization
with one-touch animation from TRANSYT-7F to COR-
SIM will be another very useful tool for users.

Inside ... 2010 HCM Chapter-by-Chapter (Pages 2-3) Updates, Training & Calendar (Page 4)

Mc Trans Center
University of Florida
Civil & Coastal Engineering
PO Box 116585
Gainesville FL 32611-6585



Phone: 352-392-0378
Toll-Free: 1-800-226-1013
Fax: 352-392-6629
E-mail: mctrans@ce.ufl.edu
Web: mctrans.ce.ufl.edu

2010 HCM-Chapter by Chapter

The signalized intersections procedure will model the
operation of an actuated controller. A new incremental
queue accumulation (IQA) method has been added to
calculate the dl delay term and the Qi length term. The
IQA method is equivalent to the HCM2000 method for
the idealized case, but is more flexible to accommodate
non-ideal cases, including coordinated arrivals and mul-
tiple green periods with differing saturation flow rates
(i.e., protected-plus-permitted left turns and sneakers).
Also, a left-turn lane overflow check procedure has been

The unsignalized intersections chapter has been split
into three chapters on two-way STOP control (TWSC),
all-way STOP control (AWSC), and roundabouts. The
TWSC method in the 2010 HCM will be capable of ana-
lyzing intersections along six-lane streets, while a queue
-estimation procedure has been added to the AWSC
method. The roundabout material is completely updated,
based on the work of the NCHRP 3-65 project, which
developed a comprehensive database of U.S. roundabout
operations and developed new methodologies for evalu-
ating roundabout performance. A LOS table for round-
abouts has also been added.

The interchange ramp terminals chapter has been
completely updated, based on the work of the NCHRP 3
-60 project.

The urban street segments chapter has been com-
pletely rewritten. The work of the NCHRP 3-79 project
has been incorporated into the chapter, providing im-
proved methods for estimating urban street free-flow
speeds and running times, along with a new method for
estimating the stop rate along an urban street. In addi-
tion, the work of the NCHRP 3-70 project has been in-
corporated, providing a multimodal level-of-service
methodology that can be used to evaluate tradeoffs in
how urban street right-of-way is allocated among the
modes using the street.

A new urban street facilities chapter is provided. The
methodology aggregates results from the segment and
point levels of analysis into an overall facility assess-
ment. Information on the impact of active traffic man-
agement measures on urban street performance will also
be provided.

The freeway facilities chapter will provide a level of
service (LOS) table for the first time, based on density.
Other changes to this chapter include updates to the ma-
terial on the impact of weather and work zones on free-

way facility capacity, along with new information on the
impact of active traffic management measures on free-
way operations.

The freeway weaving chapter has been completely up-
dated, based on the work of the NCHRP 3-75 project.
Although the general process for analyzing weaving
segments is similar to that given in the HCM2000, the
2010 HCM models are based on an up-to-date set of
weaving data. The two major differences in how the
methodology is applied are: (a) there is now a single
algorithm for predicting weaving speeds and a single
algorithm for predicting non-weaving speeds, regardless
of the weaving configuration, and (b) the LOS F thresh-
old has changed.

Most other procedural chapters have had smaller
changes. For example, the speed-flow curves in the ba-
sic freeway segments chapter have been updated, based
on an expanded database, and a 75-mph speed-flow
curve will be provided. Small changes have been made
to the ramps and ramp junctions material (now called
freeway merges and diverges) to check and correct for
unreasonable lane distributions. The two-lane highways
chapter will provide only a one-directional methodology
and several key tables and curves have been updated.
Finally, the off-street shared-use path procedures have
been updated based on U.S. data.

The 2010 HCM's organization provides information at
several levels of detail. Volume 1: Concepts provides
basic information that all HCM users should be familiar
with. The chapters in Volume 2: Uninterrupted Flow
and Volume 3: Interrupted Flow explain each methodol-
ogy in sufficient detail that an analyst can apply the
method in software and properly interpret the results.
Those users wishing a greater depth of understanding
can turn to the supplemental chapters in the electronic
Volume 4, where (in most cases) all of the computations
involved in a methodology are presented. In a few in-
stances, where methodologies involve an iterative set of
calculations, a computational engine provides the most
detailed description of the methodology. Finally, a
Technical Reference Library in Volume 4 will house
many of the original research reports that form the foun-
dation of HCM procedures.

Production of the HCM is on schedule, and it is an-
ticipated to be published by the Transportation Re-
search Board by the end of 2010.

2010 HCM-Chapter Listing

2010 10 81CIPI111 1111


rl -> iUban Street Facilities
17 L i ban Street Segments
IX Sinnalized Intersections
I I T\\ :-Way STOP-Controlled Intersections
2'I All-\\ay STOP-Controlled Intersections
21 Roundabouts
22 Intrchange Ramp Terminals
23 Off-Street Pedestrian and Bicycle Facilities

Methodolo'_ ical Details
24 C(onccpts: Supplemental
25 Frc\\ ay Facilities: Supplemental
2~l Frcci. ay & Highway Segments: Supplemental
27 F ic\ \\ay Weaving: Supplemental
2x Frlcc\ay Merges and Diverges: Supplemental
'2L Uiban Street Facilities: Supplemental
11 Li ban Street Segments: Supplemental
31 Signalized Intersections: Supplemental
2 S1 i -Controlled Intersections: Supplemental
33 Roundabouts: Supplemental
4-1 Intercrhange Ramp Terminals: Supplemental
35 Actr c Traffic Management
Case Studics
Technical R fc rence Library

1. HCM User's Guide
2. Applications
3. Modal Characteristics
4. Traffic Flow and Capacity Concepts
5. Quality and Level of Service Concepts
6. HCM and Alternative Analysis Tools
7. Interpreting HCM and Alternative Tool Results
8. HCM Primer
S9. Glossary & Symbols

S10. Freeway Facilities
11. Basic Freeway Segments
12. Freeway Weaving Segments
13. Freeway Merge and Diverge Segments
14. Multilane Highways
15 T\\,-Lane Highways



Mc Trans Center
Civil & Coastal Engineering
PO Box 116585
Gainesville FL 32611-6585

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