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Group Title: McTrans newsletter
Title: McTrans newsletter. Vol. 34.
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Permanent Link: http://ufdc.ufl.edu/UF00078185/00026
 Material Information
Title: McTrans newsletter. Vol. 34.
Series 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
Publication Date: January 2006
 Subjects
Subject: University of Florida   ( lcsh )
Spatial Coverage: North America -- United States -- Florida -- Gainesville
 Record Information
Bibliographic ID: UF00078185
Volume ID: VID00026
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved, Board of Trustees of the University of Florida

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Analyzing Congested
Signalized Intersections

In the typical signalized intersection capacity

and converted to a peak 15-minute flow rate using
the peak-hour factor for a 15-minute (duration
equal to 0.25) analysis. This is the standard
method as prescribed by the Highway Capacity
Manual (HCM) for undersaturated conditions.
However, the HCM provides for the multiple-period
analysis of oversaturated conditions to account for unmet
demand in each period in Appendix F of Chapter 16.

Data Collection
Volume is defined as the number of vehicles passing a point
during a specified time period. Demand is the number of
vehicles that desire to travel past a point during a specified
period and is frequently higher than actual volumes where
congestion exists.
Generally, volume data are collected by counting
vehicles as they cross the stop line (those getting through
the intersection), instead of counting upstream to more
accurately measure the demand (those wanting to get
through the intersection). This standard practice is fine
for intersections with a demand less than capacity, but it
is not acceptable for analyzing congested intersections.
Where demand exceeds capacity, arrival volumes must
be observed by counting the number of queued vehicles
at periodic intervals as well as the departure volumes. A
detailed method for doing this may be found in most
traffic engineering textbooks, e.g., Traffic Engineering by
Roess et al.

Analysis
Counting the unmet demand (the queue at the beginning
of the red phase) for the first 15-minute period that does
not serve all vehicles in each movement wanting to get
through the intersection permits the HCM multiple-
period procedure to model the oversaturated intersection
continued on page 2


TSIS-CORSIM 6.0 Release is
Imminent

Beta testing for the TSIS 6.0 upgrade began in November,
and this new version is targeted for release in early 2006.
The following new features are planned for TSIS 6.0:
Simulation Logic. Version 6.0 now offers improved
simulation logic for surface street lane changing, complex
intersection modeling, freeway acceleration lanes,
deceleration lanes, ramp meters, car-following, and origin-
destination modeling. An enhanced random number
generator will produce better distributions, for improved
stochastic modeling.
Graphical Input Editor (TRAFED). 1) Import Tiger
and DXF (Autocad) files in the background to draw a link-
node diagram on top of it. 2) Snap to grid so nodes can
be placed at even increments. 3) Change the background
color. 4) Cut, copy, or paste multiple links and nodes at
once. 5) Move selected links and nodes using the arrow
keys. 6) Scroll beyond the edge of the network.
Actuated Control. Actuated controller parameters may
now vary from time period to time period to simulate
different time-of-day plans. The number of actuated
controllers is now dynamic and limited only by the
number of nodes in the network. The TRAFED input
screens for actuated control have been radically changed to
make it easier to specify actuated controllers in CORSIM.
Output Processor. The Output Processor has been
redesigned to efficiently summarize any model result
generated by CORSIM.
Vehicle Animation File. The TRAFVU animation
module can now process animation files larger than 2
gigabytes. If desired, the user can now ignore any desired
set of links during animation, which reduces animation file
size.
Modeling Options. 1) CORSIM can now simulate up
to eleven through lanes in one direction on a mainline
freeway link, i.e., 5 through lanes plus 6 full auxiliary
lanes. 2) The minimum desired free-flow speed on
surface streets has been reduced to one mile per hour, to
continued on page 2


McTrans
Civil & Coastal Engineering
PO Box 116585
Gainesville FL 32611-6585
352.392.0378
Toll Free (US) 1.800.226.1013
Fax 352.392.6629
E-mail mctrans@ce.ufl.edu
http://mctrans.ce.ufl.edu/


- UNIVERSITY OF

^ FLORIDA


W Did you know?
New Products
SUpdated Products
m Advertising Directory
S Products Listing
SCalendar




McTrans January 2006


Analyzing Congested Signalized Intersections
continued from page 1

much more accurately.
In Appendix F of HCM Chapter 16, the process is defined to utilize this unmet
demand to compute the Initial Queue Delay (d3 in the HCM delay equation)
to account for the additional delay created for the current period volume by the
unmet demand queue from the previous period. This procedure also facilitates
analyzing multiple periods (each period individually) by calculating the unmet
demand from each period for use in computing the initial queue delay for the
subsequent period. In this way, the cumulative effects of delay and queuing created
by period-to-period unmet demand can be accurately modeled in oversaturated
conditions.

Results
For situations where the v/c ratio exceeds 1.0, a multiple-period analysis can
be much more comprehensive in predicting delay and queuing than the typical
single-period approach. Results from an Honors Thesis by Ms. Halah Mourad
at the University of Florida illustrated that as v/c ratios increase beyond 1.0, the
differences between delay and queue estimates differ significantly. Ms. Mourad
found:
"At v/c ratios below 1.00, the difference between the single- and multiple-period
analyses are negligible. However, as v/c ratios surpass the saturation point, the
difference between the single- and multiple-period analyses can become significant.
For example, at a v/c ratio of 1.16, the multiple-period analysis control delay
differed from the single-period analysis of the same data by approximately 110
percent, and back-of-queue values were about 60 percent greater. When v/c ratios
reached very high levels, such as over 2.00, the multiple-period analysis produced
values of control delay as much as 400 percent greater than analyzing the same data
in a single period."

HCS+
HCS+ has automated the procedures defined in HCM Chapter 16, Appendix F, to
facilitate this more comprehensive analysis of oversaturated signalized intersections.
It is important to have field data for at least the first oversaturated period, then the
procedure can compute subsequent unmet demand values for use in determining
the initial queue delay for better overall control delay and back-of-queue estimates.


NEW Products

WatsonOD

WatsonOD is a tool used for deriving and transforming origin-destination matrices
into simulation input files from traffic volume counts. WatsonOD is a dynamic
Microsoft Excel Add-In that is designed to generate origin-destination matrices
for transportation engineering and planning applications by using a variety of
distribution techniques. The tool also converts origin-destination distribution
matrices into a format that is compatible with the input file format of traffic
simulation models. WatsonOD only requires the user to provide basic traffic volume
counts to produce results. It is a powerful tool that minimizes user input and
produces reliable distribution results. WatsonOD includes several optional features
such as matrix customization and network visualization charts. WatsonOD produces
results for both arterial and freeway networks. The distribution types include
deterministic, probabilistic, and custom. WatsonOD produces generic simulation
input files for INTEGRATION and VISSIM.


TSIS-CORSIM 6.0 Release is Imminent
continued from page 1

approximate vehicles dwelling in locations such as
airport passenger pickup zones. 3) Truck lane logic
was modified to provide exclusive truck lanes in
which non-truck vehicles are prohibited. 4) Sign
control can now be active in one time period and
removed in the next time period, or vice versa. 5)
The user can now observe vehicles entering the
network during the initialization period, if desired.
Measure of Effectiveness (MOE) Data in
TRAFVU. TRAFVU now reports interval-specific
data in addition to cumulative data. Time interval-
specific data is more reflective of conditions at the
time shown. TRAFVU and CORSIM now report
exactly the same MOE values.
Run-Time Extensions. Run time extensions
(RTEs) may now access CORSIM at more than one
different processing control points, providing more
control to an RTE and allowing a wider variety of
extensions to CORSIM. New actuated control API
functions enable RTE developers to access critical
control parameters and obtain diagnostic state
information regarding actuated control.
TRF Manipulator. The TRF Manipulator
tool can be used in a script to repeatedly open
a CORSIM (*.TRF) input file, manipulate the
contents, and save the file with a new name. Well
written scripts can make this tool do much of
the previously intensive and error prone task of
changing data for experimental research.
Please check the McTrans web site for TSIS 6.0
availability, ordering, and pricing information.


HCS


The upcoming HCS+ Signals update will be
capable of generating CORSIM animation for
coordinated, lead-lag actuated controllers.

TSIS-CORSIM

For coordinated actuated controllers, the
version 6.0TRAFED graphical input editor
can now automatically convert split times (or
split percent) into the force-off times and
permissive periods used by CORSIM.

TRANSYT-7F

In addition to HCS and CORSIM, TRANSYT-7F
offers multi-period modeling, to accurately
determine delay and other measures for
oversaturated conditions.




McTrans January 2006


UPDATED Products


HSA Software New Release
-Version 3.0
X32 Group, Inc. is pleased to announce the new release
of HSA Software -Version 3.0. This new version
incorporates many powerful features. In the past, the
most frequent request from the software users was saving
Collision Diagrams after editing. Now you can not only
Save, but also Undo and Redo the changes you make
when editing diagrams. A diagram is saved as a sequence
of editing commands. You can move any number of
steps back or forward in editing process, even after you
open saved diagram, and then continue editing. If at
some point you need to make corrections in accident
data or add new records, you can do it and then
continue editing without re-generating the diagram.
And there is more! In addition to moving and
copying accident symbols, you can now Rotate them.
This will allow using arbitrary road geometry layouts
as a background for your diagram, including skewed
intersections, ramps, curves, and roundabouts. If you
want to display several intersections or driveways on
your diagram, you may need to Reduce accident symbol
size to make symbols fit better. You can do this now
- just one button click for smaller or larger symbols.
And the last, but not the least major new update is
Charts. You can create a variety of data charts displaying
different accident categories and conditions. Charts can
be generated for the entire time period studied, or per
year. HSA Software 3.0 introduces the new proposed
terminology in highway safety analysis "Direction
Daisy" (similar to "Wind Rose"). This is a chart that
displays various accident parameters by direction of
travel of vehicles involved. The daisy-chart may be
helpful in revealing accident patterns specific to certain
direction of travel or intersection approaches.
There are other helpful upgrades that enhance
software operation. In addition the User's Manual has
been updated to incorporate all new features, and a new
Demo is available.


Update Watch


Package


Visual TEAPAC A Whole New Way of Seeing
TEAPAC!

Visual TEAPAC (Version 7) has been released with major enhancements to the
1-click seamless integration of every TEAPAC program. Primarily this consists
of a new graphical input interface and enhanced, graphical output reports
using color.
The new graphical front-end allows network creation, editing and display
directly on-screen, including:
drag-and-drop creation or editing of the analysis network,
an optional bitmap background for ease of creating network and visualizing
results (aerial photo, map, plan drawings, etc.), and
right-click access to all data entry dialogs, as well as analysis results dialogs.
The new enhanced graphical output reports make results easier to read and
nicer to look at, including full use of color and graphics drawing for arrows,
phasing diagrams, permitted movements, time-space diagrams, intersection
diagrams, cycle optimization graphs, daily count variation graphics, etc. All
enhanced graphical results are printable on any color or black-and-white
printer supported by Windows and pastable as bitmaps into any other
application.
In addition to the generic changes described above which are found in all
TEAPAC programs, SIGNAL2000 and all the TEAPAC PRE-processors
feature a new ring-based timing display option and new permitted left
turn features for enhanced HCM2000 capacity analysis, HCM capacity
optimization and design of signals and signal arterials/networks. The SITE
programs performs on-screen traffic assignments on the new graphical network
display in the main window for enhanced site impact traffic planning studies
which seamlessly interface with the other TEAPAC programs.
Visual TEAPAC has all the seamless data exchange features first offered by
TEAPAC2004 for the 13 TEAPAC programs and 14 third-party programs,
including:
one data file carries all the data for all programs, with up to 500
intersections per file/analysis,
one-click, instant transfer of control and input data from one program to
another,
one-click exchange of results to each other, such as peak period volumes,
PHFs, projected polumes, optimized timings, etc., and
upwards/downwards compatibility with prior TEAPAC data files.
Help files include the complete user guide, with free downloadable manuals in
printable and searchable .pdf format.


Version Status


Target


Distribution


HCS+TM
TRANSYT-7F
TSIS
IDAS
QuickZone
TNM
Turbo Architecture


Complete
Complete
Testing
Complete
Complete
Complete
Complete


Available
Available
March
Available
Available
Available
Available


Registered Users received CD
Patch download
Registered Users may upgrade
Sent to Registered Users
Sent to Registered Users
Sent to Registered Users
Patch download




- McTrans January 2006


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Available in:


* Signals
* Unsignal
* Freeways
* Weaving
* Ramps

* Requires TSIS/CORSIM


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"You mean that's all I have to do?"





. UNIVERSITY OF

FLORIDA


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


Calendar

NEED Training?

Highway Capacity Analysis
(HCS+)
TRANSYT-7F Release 10
CORSIM (TSIS 5.1) for
Beginners
QuickZone
Traffic Engineeing
Fundamentals
Site Impact Analysis
Access Management

Contact McTrans to set up a
training course in your area, or
read about currently scheduled
training courses at:
http:llmctrans.ce.ufl.edul
training/





Mcirans


Training


Signal Capacity Analysis Seminar
McTrans 1-800- 226-1013 ext. 229


Mar 9, 2006
Mar 16, 2006


Highway Capacity Analysis Seminar
McTrans 1-800-226-1013 ext. 229

Traffic Network Study (TRANSYT-7F) Seminar
McTrans 1-800- 226-1013 ext. 229

CORSIM Simulation for Beginners
McTrans 1-800-226-1013 ext. 229

"Designing Optimized Traffic Signals and Systems
Using Visual TEAPAC, PASSER, TRANSYT and CORSIM"
Strong Concepts 847-564-0386

FHWATraffic Noise Model (TNM) 2.5 Training Course
Bowlby & Associates 615-771-3006, ext. 222


Conferences

TRB Annual Meeting
TRB 202-334-3472

ITE Technical Conference
ITE 202-289-0222


ITE Annual Meeting
ITE 202-289-0222


Jan 11-13, 2006
Mar 13-15, 2006


Feb 26-Mar 3, 2006


Jan 22-26, 2006


Mar 19-21,2006


Aug 6-9, 2006


Atlanta, GA
Seattle, WA


Las Vegas, NV
Orlando, FL


Franklin, TN


Washington, DC


San Antonio, TX


Milwaukee, WI


Moving Technology http://mctrans.ce.ufl.edu/training/ for up-to-date training information


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