Sidra Presentation on Roundabouts

Toronto SimCap
Toronto, ON, Canada, July 2014
SIDRA INTERSECTION 6
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Management
System
Certificate #
QEC27492
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SIDRA the word …
Signalised
(and unsignalised)
Intersection
Design and
Research
Aid
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Training
Over 220 training workshops
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attending since July 2000.
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SIDRA INTERSECTION Background
First released in 1984
Continuous development in response to
user feedback
SIDRA INTERSECTION 6
(including NETWORK Model)
• Biggest changes in the 30-year
history of the software
• Major data structure and user
interface changes
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About 9000 licences in 1650 organisations
in 82 Countries
SIDRA INTERSECTION Users
USA
563
Australia
377
South Africa
103
Canada
94
Arabian Peninsula
77
Malaysia
64
New Zealand
61
Slovenia
8800 Licences
34
Singapore
26
(1650 Organisations)
Spain
23
Norway
20
82 Countries
Italy
17
United Kingdom
15
Chile
14
Other Europe
Latest Version 6.0, 5.1, 5.0, 4.0, 3.x Users Only
(23 May 2014)
53
Other Asia and Africa
Other Latin America
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71
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What makes SIDRA INTERSECTION different?
STRONG RESEARCH BASE:
Empirical and theoretical methods combined ...
Metering Signals Research
for VIC ROADS
20 years at Australian Road Research Board
14 years at Akcelik & Associates
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What makes SIDRA INTERSECTION different?
Not just a roundabout software package !
Micro-analytical method for
evaluating alternative treatments for
INTERSECTIONS AND NETWORKS
in one package:
MODEL CONSISTENCY
in evaluating alternative
intersection treatments
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•
•
•
•
Roundabouts
Signals
Sign Control
Pedestrian Crossings
What makes SIDRA INTERSECTION different?
MODEL CONSISTENCY for different
intersection types (definition of delay,
back of queue, stops, etc).
Unique gap-acceptance
method by signal analogy
helps to model back of
queue and stops for
roundabouts and twoway sign control.
Important for
NETWORK
Modeling
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What makes SIDRA INTERSECTION different?
LANE-BASED MODEL
More realistic and reliable analysis
compared with approach - based and
lane group (link) - based methods
from UK and USA:
Exit Short
Lane
Slip / Bypass Lane
for BUSES ONLY
• General: Unequal lane flows, De facto
exclusive lanes, Short lanes (approach
and exit), Slip / Bypass lanes (Giveway / Yield, Continuous, Signals)
• Roundabouts (Circulating lane use;
Dominant and subdominant lanes)
• NETWORK Model (lane queues, lane
blockage, signal platoon arrival and
departure patterns)
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Approach
Short Lane
Individual approach,
exit and circulating
lanes have different
characteristics
What makes SIDRA INTERSECTION different?
VEHICLE PATH model for
Distance
Four Basic
Path Elements
stop-start traffic
•
Emissions - CO2, CO, HC, NOx
•
Fuel Consumption
•
Operating COST
Time
Also used for
Geometric Delay calculations
Speed
Time
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Acceleration – Deceleration models
Polynomial
acceleration
profile model
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Light Vehicles
Heavy Vehicles
New in SIDRA INTERSECTION 6
Toyota Corolla Ascent 2004
Estimated fuel consumption (mL/s)
Fuel and emission model
parameters updated for
modern vehicles
Model parameters are
available for user input
(model calibration )
3.0
y = 0.9903x + 0.0076
R² = 0.9774
2.5
Estimated vs
measured
instantaneous
fuel consumption
rates
2.0
1.5
1.0
0.5
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Measured fuel consumption rate (mL/s)
“Fuel Consumption and
Emission Models Calibrated for
Modern Vehicles” (IPENZ 2012)
3.0
FuelConsumption (mL/s)
Toyota Corolla Ascent 2004
2.5
Measured Fuel Consumption
Estimated Fuel Consumption
2.0
www.sidrasolutions.com/Resources
/Articles
1.5
1.0
0.5
0.0
0
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100
200
300
400
500
Elapsed time (s)
600
700
800
900
1000
Level of Analysis Detail
more detailed model
of TRAFFIC STREAM
Individual
vehicles
Microsimulation
models
Drive cycles
(Vehicle
paths)
SIDRA
INTERSECTION 6
Traffic
flows
TRL (UK)
Roundabout
Model
Speed-flow
functions
Strategic
transport
planning models
APPROACHES
HCM (US)
(Signals, Signs)
TRANSYT
HCM (US)
(Roundabouts)
HCM: Highway
Capacity
Manual (2010)
Lane Groups /
LINKS
Individual
LANES
Lane SEGMENTS
more detailed model of ROAD GEOMETRY
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Microanalytical
model
What makes SIDRA INTERSECTION different?
Includes two Roundabout Capacity Models
• SIDRA Standard (calibrated for US driving conditions)
• HCM 2010
Common fundamental features:
• Geometry and Driver Behavior (Gap
Acceptance) effects combined
• Lane-based method
• Empirical and theoretical methods
combined
• Non-linear form
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What makes SIDRA INTERSECTION different?
SIDRA Standard Model Advantages
• Numerous extensions
• More extensive GEOMETRY parameters than HCM 2010
8.0
4.0
3.5
More capacity
Di = 50, ne = 2
3.0
Di = 80, ne = 3
2.5
2.0
1.5
1.0
0.5
0.0
7.0
Di = 50, ne = 2
6.0
More capacity
Di = 80, ne = 3
5.0
4.0
3.0
2.0
1.0
0.0
0
300
600
900 1200 1500 1800 2100 2400 2700
Circulating flow (pcu/h)
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Di = 30, ne = 1
Di = 30, ne = 1
Dominant lane critical gap (s)
Dominant lane follow-up headway (s)
• Follow-up Headway and Critical Gap values decrease with
increased circulating flows
0
300
600
900
1200 1500 1800 2100 2400 2700
Circulating flow (pcu/h)
What makes SIDRA INTERSECTION different?
Roundabout
Geometry
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What makes SIDRA INTERSECTION different?
Now a powerful lane-based
micro-analytical NETWORK
• all intersection types
MODEL
(signals, roundabouts, sign control)
•
easy to configure using SIDRA Sites
diverse Movement Classes
Light Vehicles
Heavy Vehicles
Buses
Bicycles
Large Trucks
Trams / Light Rail
two User Classes
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Combined with the
lane-based method, new
Movement Classes allow
modeling of Bus Priority
Lanes, Bicycle Lanes,
and so on …
What makes SIDRA INTERSECTION different?
Unique Method for
Complex Network Design and Congestion Modeling
Backward spread of
congestion (reduced
upstream capacity)
Capacity constraint
(reduced downstream
arrival flows)
The two basic elements of the model are highly
interactive with opposing effects.
SIDRA INTERSECTION 6 uses a network-wide
iterative process to find a solution that balances
these opposing effects.
Backward spread of congestion and capacity
constraint are common to all intersection types.
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SIDRA INTERSECTION Version 6
SIDRA NETWORK model:
Backward spread of congestion: capacity reduction at
upstream lanes blocked by downstream lane queues.
Capacity constraint: oversaturated upstream lanes
reduce demand volumes for downstream movements
Lane Movements: blockage of upstream lanes depends
on lane choices of movements from approach lanes to
exit lanes
Upstream and downstream lane flows and mid-block
lane changes on an approach to determine platooning.
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Network Example: Freeway Interchange Comparison
Roundabout Interchange
Signalized Diamond Interchange
Diverging Diamond Interchange
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Example: Staggered
T Roundabouts
Two T-shaped
roundabouts placed
with 50 m distance
between them to
demonstrate the
lane-based network
model.
Canadian ITE 2013
Annual Meeting
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Signal Timings: Variable Phase Sequence Analysis
Diamond Overlap Variable Phase Sequence
* Variable phase
B1*
A
E1*
C
B2*
D
F
E2*
Sequences generated:
A - B1 - C - D - E1 - F
A - B1 - C - D - E2 - F
A - B1 - C - D - F
A - B2 - C - D - E1 - F
A - B2 - C - D - E2 – F
A - B2 - C - D - F
A - C - D - E1 - F
A - C - D - E2 - F
A-C-D-F
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Pedestrians at signals
Slip lane crossing and diagonal crossing (all-pedestrian phase) features
and more flexible pedestrian staged crossing arrangements
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Flexible Geometry
Two-Segment Lanes (with lane segments that can
be allocated to different Movement Classes)
Contra-flow lanes
Strip islands (between lanes)
High-angle and low-angle
slip (bypass) lanes
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SIDRA INTERSECTION 6 New Features - Summary
Bus Priority Lane and Phase Example
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Two-Way Sign Control (Give Way and Stop)
Method to adjust critical gap and follow-up headway automatically for
intersection geometry and control, with option to apply reduction with
opposing flow rate
Pedestrians
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DEMAND AND SENSITIVITY Analysis
Design Life, Flow Scale and
Sensitivity Analysis options with
reports and Graphs for
 intersection
 lane
 approach
 movement (including
separate results for
individual movement classes)
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User Models
 Two User Models for
calibrating the complete
default system for local
conditions
 Edit
 Reset Defaults
 Export
 Import
 This facility will be
supported in future versions
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Major New Features Introduced in
SIDRA INTERSECTION 6 Recently
 User Models
Model Calibration Needs
 Input Comparison
 Output Comparison (Site & Network)
 Variable Run
 Network Configuration Enhancements
 Network Displays
 Network Flows
 Network Clone and Import
 API and Utilities:
• Excel Applications VOLUMES and ANNUAL SUMS
• Linking with other software packages
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SIDRA Success Stories – Example 1
Fitzsimons Lane - Porter St Roundabout, Melbourne, Australia
Using SIDRA, Vic Roads engineers
redesigned a highly congested
two-lane roundabout in
Melbourne as a
three-lane roundabout
eliminating persistent congestion.
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SIDRA Success Stories – Example 2
Ferntree Gully Rd - Scoresby Rd (Melbourne)
Actuated Signalised Intersection
The SIDRA estimates of performance measures for actuated signals were
found to be highly accurate based on the results of real-life surveys at an
intersection in Melbourne.
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y = 1.1033x - 0.3682
R2 = 0.9761
16
Queue clearance time (s)
(SIDRA estimate)
Average back of queue (veh)
(SIDRA estimate)
20
12
8
4
25
20
15
10
5
0
0
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y = 1.0693x - 1.7702
R2 = 0.9693
30
4
8
12
16
Average back of queue (veh) (Manual survey)
20
5
10
15
20
25
30
Queue clearance time (s) (Manual survey)
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SIDRA Model Success Stories – Example 3
SIGNALISED INTERSECTIONS
US North Carolina State University carried out a comprehensive study and
evaluation of alternative software packages for signalised intersections
(SIDRA, TRANSYT, HCS/HCM, Signal 94, HCM/Cinema, EVIPAS)
for the North Carolina DOT. The report stated:
“SIDRA’s powerful combination of high model usability, superior
matching of field delays at the lane group level, versatile
optimization features, and graphical user interface makes it the
model of choice.”.
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SIDRA Model Success Stories – Example 4
Richmond Rd and Garfield Rd Intersection,
Marsden Park, NSW, Australia
ARRB study for AUSTROADS (Project NS 1371 Modelling and Analysis of Network Operations)
compared micro-analytical (SIDRA INTERSECTION)
and microsimulation (VISSIM) modelling of this
intersection including comparison against field
measurements.
The study found that
“Cycle average queue estimates were
within one vehicle of field measurement”.
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SIDRA TRIP
Version 1.1 released with new Licensing!
Vehicle Trip Assessment Software for GPS Data
• travel level of service
• performance (delay, speed, travel time)
• operating cost and user cost
(including toll cost)
• fuel consumption
• emissions
• noise
and Quick Scenario Analysis
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SIDRA TRIP
SIDRA TRIP Data: Two methods
 Data collected by an
instrumented vehicle,
e.g. using a GPS data
logger
 User-specified drivecycle data
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SIDRA TRIP
Using SIDRA TRIP, you can
assess:
• Travel conditions
• Traffic performance
• User Cost / Operating
cost
• Fuel consumption
• Emissions
• Noise
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END OF PRESENTATION
Thank you!
www.sidrasolutions.com