1. introductiononlinepubs.trb.org/onlinepubs/webinars/150611.pdf · o hcm and rodel both utilize...
TRANSCRIPT
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Outline
1. Introduction
2. Basis of Rodel 10 mins
3. Transferability and Validation 10 mins
4. Program Inputs and Outputs 10 mins
5. Demo of Program 10mins
Rodel - OutlineRodel - Outline
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• Analysis process that facilitates convergence of design solutions to meet operational objectives
• Quickly explore / identify viable alternatives for given flows, site constraints and project objectives
• Particularly well suited for:o Constrained, high-flow locationso Flared entries, corridors
Huffman Road Corridor, Anchorage, AK
Rodel - IntroductionRodel - Introduction
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o Originally released in 1986 in the UK
o Used by many agencies and consultancies across US since ~1992
• Major Update in 2012: RODEL V1-Windows (current v1.88)o Conformance with North American Design and Analysis Practices
Right (or Left) Hand Drive
English (or Metric) Units
U.S. Peak Hour Factor (PHF)
Original Synthesized input
Original Direct Input features
o Print Selection Menu for Documentation
o Importantly it has maintained its unique interactive interface
Rodel - IntroductionRodel - Introduction
Rodel users around the world
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• Capacity Models (Calibration for each)
o Empirical Model - Kimber/Hollis,TRL LR942, 1980o Rodel v1.88 extends the application of Kimber’s equations to US/North American design practices
and principles
o By-Lane Inputs Determine “Effective Geometry”
o Full integration of the 2010 HCM Capacity Model Identical results to HCS
(HCM2015 update forthcoming)
• RT Bypass Lane Modeling (Full and Partial/Yield)
• Crash Prediction Models & Economic Analysis
o US and UK Intersection and Approach Level crash prediction methodologies to derive injury and damage-only crash ratios from geometric parameters, safety criteria, and traffic flows
o Crash and Delay costs are derived from user input values for each
Rodel - IntroductionRodel - Introduction
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Rodel’s user interface developed to facilitate understanding of analysis and explore the design envelope for solutions
• Input and outputs are:o Explicit numerical values (no unknown factors)
o Informs analyst/designer of the geometric and operational interrelationships
o Interactive and educational user interface –pop-up help and embedded user manual
Rodel - IntroductionRodel - Introduction
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Rodel’s user interface includes:
• Sensitivity Testing - “What if” scenarios o Increase/decrease % of traffic for specific
approaches - tests robustness of the designo Test with reduced capacity (due to context –
on-street parking, environmental/snow)o Assess the potential for unacceptable queues or delayso View output simultaneously to easily explore geometry to
achieve acceptable queues and delays
Rodel - IntroductionRodel - Introduction
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Traffic Planning:• User-specified
operational parameters of Delay, 95% Queue, V/C Ratio
• Output: Sets of geometric parameters to meet targeted parameter
Rodel - IntroductionRodel - Introduction
Full Geometrics:• Refines Geometry
• Bypass Lane Modeling
• Pedestrian Capacity Effects
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HCM Compliant
o HCM and Rodel both utilize ‘Time Dependent Queuing Theory’ (developed by US researcher P.M. Morse)
o Delay is derived from queuing theory equations; therefore,nothing in this respect is different from HCM to Rodel
o However, Rodel incorporates ‘High Definition’ Queuing theory equations (via time slices) that adjust for varying v/c ratios
o This provides stability over the entire range of v/c ratios,exceeding 1.0 Provides accurate operational predictions at higher v/c ratio conditions
– HCM simplified single equation - stable to ~0.90
Rodel’s - IntroductionRodel’s - Introduction
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Basis of Rodel – Empirical Model
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UK Research Development
• 1960-70s congestion relief -national imperative in the UK
• Significant design experimentation was conducted on congested/fully saturated roundabouts
• Existing analysis methods were not matching observed operations
• Desired an accurate analysis methodology anchored to the design geometrics directly
• Statistical – Regression analysis approach was undertaken
Research Basis Background
Modifications to large congested roundabouts
Basis of Rodel - Empirical ModelBasis of Rodel - Empirical Model
TRL Kimber / Hollis (LR 942)
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• 1980 UK published Kimber / Hollis Capacity Equations (LR 942) – 11,000 min of “at-capacity”
analysis of 86 roundabout entries over the full range of geometries and traffic volumes.
• Re-checked the equations and found them to be very stable, no changes required– Stability is attributed to the
large statistical database collected over the full range of geometric and traffic flows
Basis of Rodel - Empirical ModelBasis of Rodel - Empirical Model
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GEOMETRY
CAPACITY
LaneInteraction
Kimber’s Equations
gap forcing
priorityreversal
Merging
Driver behaviorvariation described directly via the geometrics
Significant departure from their existing gap-based procedures
Basis of Rodel - Empirical Model Basis of Rodel - Empirical Model
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E V
L
2Ø
D
6 Parameters
Started with 35 geometric parameters, then 16, to 9, and finally 6 statistically significant
Kimber / Hollis (LR 942)
Basis of Rodel - Empirical Model Basis of Rodel - Empirical Model
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6 Geometric Inputs3 Major Capacity Variables
• Entry Width (E)
• Approach Width (V)
• Effective Flare Length (L’)
6 0 0
8 0 0
1 0 0 0
1 2 0 0
1 4 0 0
1 6 0 0
4 5 6 7 8 9 1 0 11 1 2 1 3 1 4E n tr y W id th E (m e tre s )
Capa
city
(Pc
us)
Capa
city
(Pc
us)
1 0 0 0
1 2 0 0
1 4 0 0
1 6 0 0
1 8 0 0
0 1 2 3 4 5 6 7 8 9 1 0H a lf W id th V (m e tre s )
Cap
acity
(Pc
us)
Cap
acity
(Pc
us)
6 0 0
8 0 0
1 0 0 0
1 2 0 0
1 4 0 0
1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0
F la re L e n g th L ' (m e tr e s )
8 0 0
1 0 0 0
1 2 0 0
1 4 0 0
1 6 0 0
6 0 0
8 0 0
1 0 0 0
1 2 0 0
1 4 0 0
0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 08 0 0
1 0 0 0
1 2 0 0
1 4 0 0
1 6 0 0
E n try R a d iu s R (m e tr e s )
0 2 0 4 0 6 0 8 0 1 0 0E n try A n g le N ( d e g )
3 0 4 0 5 0 6 0 7 0 8 0
In s c r ib e d C irc le D ia m e te r D ( m e tre s )
Basis of Rodel - Empirical ModelBasis of Rodel - Empirical Model Research has Established the Geometric Relationships
V E
L’ D
R PhiD = 180ft
D = 300ft
Circulating Flows
Cap
acity
(D)
3 Minor Capacity Variables
• Entry Radius (R)
• Entry Angle (Φ)
• Diameter (D)
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Basis of Rodel - Empirical ModelBasis of Rodel - Empirical Model3 Major Capacity Variables
Approach Width
Entry Width
Flare Length (L’)
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Basis of Rodel - Empirical ModelBasis of Rodel - Empirical ModelMinor Capacity Variables
Rad
Phi
Radius
Entry Angle
“Phi” is half the measured angle
R
R
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Understanding Capacity Mechanisms • Allows for convergence of desired Operational Objectives
within available space and context
AVOID UNDERDESIGN (less capacity than required): – Early Congestion
• High levels of delay• Poor public opinion
AVOID OVERDESIGN (more capacity than necessary):– More entry lanes required
• Larger, faster, less safe geometry • Greater impacts, more right-of-way • Higher costs• Less feasible
Basis of Rodel - Empirical Model
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U.S. Validationand Transferability for
North American Practices
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Are UK drivers more accustomed to roundabouts, producing higher capacities?• Possibly smaller cars or smaller
trucks?
Single-Lane Entry Widened For Trucks, Not CapacityUS vs UK Design Practices
Researchers confused a widened single-lane entry for trucks with a flared entry design
Rodel’s Transferability and ValidationRodel’s Transferability and Validation
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Enhanced Empirical Model (lane-based) • By-lane inputs determine “Effective Geometry”
• Avoids incorrect use – overestimation of capacity
Rodel’s Transferability and ValidationRodel’s Transferability and Validation
nc+
nc
Leg1
ne
Leg 2
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Kimber LR 942 – Single-Lane Capacity
1,130
Kimber LR 942 matches US Data
Rodel’s Transferability and ValidationRodel’s Transferability and ValidationSingle-Lane Entry Widened For Trucks, Not CapacityUS vs UK Design Practices
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Kimber LR 942 – Flared 2-Lane Capacity
1,800
Rodel’s Transferability and ValidationRodel’s Transferability and Validation
Rodel matches US Data
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Larger Curvilinear Single-LaneUrban Single-Lane
Rodel Prediction vs US Data Rodel Prediction vs US Data
FHWA TOPR34 Data: will be used to develop a new HCM2015 model
Rodel’s Transferability – Single Lane Prediction vs US DataRodel’s Transferability – Single Lane Prediction vs US Data
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2,126
1,100
Rodel’s Transferability – Dual Lane Prediction vs US Data Rodel’s Transferability – Dual Lane Prediction vs US Data
1,180
FHWA TOPR34 Data: will be used to develop a new HCM2015 model
Rodel Slope and Intercept output easily accessible on main screen
2,126
Rodel Cap Line
HCM 2010
2012 Data
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Analysis forAll Types of Roundabouts
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Accurate Operational Assessment for All Types of Roundabouts
Pho
to: W
erne
r B
rilo
n
Small Urban Compact Larger Curvilinear Single-Lane
• 80’ ICD• Narrow entry width E= 12’• Small entry radii R = 25’ • Perpendicular entries Phi ~ 60 deg.
• 145’ ICD• Wider entry width E = 14’ • Larger entry radii R = 60’ • Curvilinear entry Phi ~ 20 deg.
Basis of Rodel - Empirical ModelBasis of Rodel - Empirical Model
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Large Multi-Lane
• 125’ ICD• Flared Two-Lane Entry• Single-Lane Entry • Aux RT Lanes (two types)
• 225’ ICD• Flared Off-Ramp Entry• Two and Three-Lane • Aux RT Lanes (two types)
Compact Flared Multi-Lane Entries
Accurate, Versatile, Robust Operational Assessment for All Types of Roundabouts
Rodel’s StrengthsRodel’s Strengths
Hybrids, Turbos, Urban Compact, Rural High-Speed
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Rodel’s Strengths – Single LaneRodel’s Strengths – Single Lane
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Single Lane Exit
Single Lane Approach
Single Lane Circulating
Rodel’s Strengths – Single LaneRodel’s Strengths – Single Lane
Single Lane Entry
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Yield RT Bypass Lane
Single Lane Entry
Full RT Bypass Lane
Yield RT Bypass Lane
Rodel’s Strengths – Bypass ModelingRodel’s Strengths – Bypass Modeling
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Rodel’s Strengths – Hybrid and Turbo/Spiral Designs Rodel’s Strengths – Hybrid and Turbo/Spiral Designs - Single Lane / Multi-Lane- Flared or Parallel Entries- Hybrid / Turbo /Spiral- Bypass Lanes
Two Lane Entry
Yield RT Bypass Lane
Two Lane Entry
Merge RT Bypass Lane
Single Lane Entry
Two Lanes Circulating
Flared Entry
Yield RT Bypass Lane
Single Lane Circulating
Two Lane Exit
Flared Entry
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Merge Bypass Lane
Three Lane Entry
Full RT Bypass Lane
Yield RT Bypass Lane
Three Lane Exit
Three Circulating Lanes
Rodel’s Strengths – Multi-Lane 3-4 lanes, Bypass LanesRodel’s Strengths – Multi-Lane 3-4 lanes, Bypass Lanes
Merge or Full Receiving downstream lane Bypass Lane
Merge downstream Bypass Lane
- Single Lane / Multi-Lane- Flared or Parallel Entries- Hybrid / Turbo /Spiral- Bypass Lanes
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Exit Roadway Width (Ex)Number of Lanes (n)
Circulatory Roadway Width (c)Number of Lanes (n)
Entry Width (E)Number of Lanes (n)
E
Approach Width (V)Number of Lanes (n)V
Flare Length (L)E+V
2
L
E=22’
11’’
V=12’
12’
L=150’
11’’
17’
Rodel’s Strengths – Flared EntriesRodel’s Strengths – Flared Entries
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Program Overview
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Main Screen - Empirical Capacity Model
Geometry
Traffic
Results
Rodel’s InterfaceRodel’s Interface
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Main Screen - HCM Capacity Model
Geometry
Traffic
Results
Rodel’s InterfaceRodel’s Interface
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Project Information (Open or New, Print Menu, +/- Legs, Notes, Exit flows, Time Slices)
Rodel’s InterfaceRodel’s Interface
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Project Information (Model, Delay (Control or Queue), Input ( PHF, Direct, Synthetic) Peak am/pm)
Rodel’s InterfaceRodel’s Interface
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Lanes/Geometric Inputs, Capacity Modifiers
Rodel’s InterfaceRodel’s Interface
Geometry
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Visual Geometry Editor
Rodel’s InterfaceRodel’s Interface
Geometry
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Secondary Input (Calibration, Crash, Economic, Bypass)
Rodel’s InterfaceRodel’s Interface
Secondary Inputs
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• Transition• Secondary
– Bypass– Calibration– Safety/Economic analysis
Rodel Interface – Secondary Inputs
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Calibration, Accidents, Economics, Bypass Lanes
Rodel’s InterfaceRodel’s Interface
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Calibration – Empirical Model
Embedded Help TutorialEmpirical Calibration
Rodel InterfaceRodel Interface
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Calibration - HCM Model
HCM2010 Calibration HCM2010 Calibration - tf
HCM2010 Calibration - tc
Rodel InterfaceRodel Interface
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Choose Accident Model
Calibration, Accidents, Economics, Bypass Lanes
Output in Rates/M entering or number of crashes by type
Rodel InterfaceRodel Interface
AADT from PH
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Accident Models Economic Evaluation
Calibration, Accidents, Economics, Bypass Lanes
Rodel InterfaceRodel Interface
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Calibration, Accidents, Economics, Bypass Lanes
Rodel InterfaceRodel Interface
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Embedded Tutorial – Bypass Lanes
‘Full’ Bypass Lanes
Downstream MergeCondition
Free
Rodel InterfaceRodel Interface
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Embedded Tutorial – Bypass Lanes
‘Yield’ Bypass Lanes
1 or 2 Lanes typ.
Rodel InterfaceRodel Interface
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Results (Flow rates, v/c, Delay, Q, 95Q, LOS)
Results
Rodel InterfaceRodel Interface
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Results Output – Slope and Intercepts
ResultsCapacity
Rodel InterfaceRodel Interface
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Results Output - Accidents
ResultsAccidents
Rodel InterfaceRodel Interface
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Results Output - Accident Rates
ResultsAccident Rates
Rodel InterfaceRodel Interface
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Results Output - Economics
ResultsCosts
Rodel InterfaceRodel Interface
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Results Output - Global
ResultsGlobal
Rodel InterfaceRodel Interface
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Embedded Help Pop-ups
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Main Screen – Pop-up
Rodel InterfaceRodel Interface
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Main Screen – Pop-up
Rodel InterfaceRodel Interface
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Embedded User Manual – Provides Detailed Guidance
Rodel InputsRodel Inputs
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Main Screen – Error Messages
Rodel InterfaceRodel Interface
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Main Screen – Error Messages (Same in HCM Model)
Rodel InterfaceRodel Interface
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Main Screen – Warning Messages
Rodel InterfaceRodel Interface
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Main Screen – Warning Messages
Rodel InterfaceRodel Interface
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© 2015 Rodel Interactive
Thank you!Live Demo
With Available Time
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Insert the title of your presentation here Presented by Name Here Job Title - Date
ARCADY Roundabout Analysis Tool James Bedingfeld
11 June 2015
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Table of contents
Page 2
Background and theory of ARCADY
Critical inputs for utilising ARCADY software
Step-by-step guide for data input
Output facilities
Analysis of the outputs
1
2
3
4
5
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Background of Capacity Models
Page 3
o Capacity models based on research undertaken throughout last 40 years.
o The capacity equations were derived from extensive research into effects of various junction parameters.
o Empirical formula is used to calculate capacity as a function of geometry and traffic flows.
o Formulae themselves based on results of studying large number of real junctions and carrying out best-fit regression analysis
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Background of Capacity Models
Page 4
o TRL undertook the capacity relationship of modern roundabouts in the UK during the 70’s and 80’s.
86 roundabout entries studied
11,000 minutes of capacity operation recorded
500,000 vehicles observed
o Reviewed these relationships in mid 1990’s to ensure appropriateness of the model.
o Managed contract to develop capacity relationships for large / grade separated roundabouts and mini-roundabouts.
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Capacity Models within ARCADY
Page 5
o Normal / standard roundabout capacity model
o Large / grade separated roundabouts o UK style mini-roundabouts
o HCM 2010 roundabout capacity model
o HCM AWSC and TWSC included in ARCADY 9 to allow
direct comparison for alternative intersection configurations
o Lane Simulation to model various lane configurations / movements
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Principles of the program
Page 6
o Single island at-grade normal roundabouts o Large and Grade-separated o Mini-roundabouts o 2-20 arms o Linked roundabouts o Entry lane simulation
ARCADY junctions that can be modelled
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Principles of the program
Page 7
o The program uses empirical formulae to calculate the capacity of each entry arm as a function of the geometry and the circulating flow crossing in front of the entry.
o For standard roundabouts, this is formulated as:
Qe = Fi - fi Qc
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Page 8
Entering flow, Qe
Circulating flow, Qc (Controlling flow)
F0
Intercept
CAPACITY - Two dimensional
Relationship is...
Qe = F0 - A1Qc Qe
Qc
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Principles of the program
Page 9
o Another basic feature of ARCADY is the way in which flows from individual arms of a roundabout are linked.
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Page 10
o ARCADY predicts capacity as a function of flow and geometries.
o For a basic ARCADY assessment the critical inputs are:
Six geometric parameters
Demand for each leg
Turning proportions for each leg
o On completion of the measurements setting up a basic file within the software can take no longer than 10 to 15 minutes
Critical inputs for utilising ARCADY software
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Critical Inputs – Vehicle Demand
Page 11
o One of the two main components for determining capacity is traffic flow.
o Essential therefore that accurate traffic counts, or predictions, of Demand and Turning Movements occur.
o Demand data is the traffic flow that demands entry on an approach during a specific time period (whether 15 minutes, 1 hour etc).
o When measuring demand this should be at a point further upstream from the intersection than the maximum queue encountered.
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Critical Inputs – Vehicle Demand
Page 12
1. ‘DIRECT’ direct data for all arms 2. ‘LEVELS’ pre-peak, peak and post-peak flow levels 3. ‘FOUR’ 4 consecutive hourly
counts
4. ‘ONE HOUR’ One hour's peak flow usually as O-D table
5. PHF normal”, symmetric profile, fixed spread but peak may vary
6. Flat Flat profile based on a single number
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Page 13
both can vary in time and from arm to arm
turning proportions may be:
• specified directly or
• obtained from entry and exit flows (Furness Balancing) or
• implicit (from O-D matrix)
Critical Inputs – Vehicle Demand
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Critical Inputs ARCADY Major Geometric Parameters
Approach width (v)
B
A
F’
G
D
BD
2
Flare length (l’)
Page 14
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Critical Inputs - ARCADY Minor geometric parameters
ENTRY RADIUS, r
INSCRIBED CIRCLE DIAMETER, D (ICD)= 2 x R
Radius , R
ENTRY (CONFLICT) ANGLE, Phi
φ
Page 15
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Step-by-step guide for data input - Starting a New File
Page 16
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Page 17
Data Outline Diagram
Step-by-step guide for data input - Starting a New File
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Step-by-step guide for data input - Developing a basic file
Step 1
File Description:
Access via Data Outline
Enter job details such as location, client, job number etc
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Step-by-step guide for data input - Developing a basic file
Step 2
Analysis Sets
Access via Data Outline
Adding new / Copying exiting Analysis Set
Page 19
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Step 3
Demand Sets
Access via Data Outline
Adding new / Copying exiting Demand Set
Page 20
Step-by-step guide for data input - Developing a basic file
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Step 4
Set Units Access via Data>Units
Page 21
Step-by-step guide for data input - Developing a basic file
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Step 5 – A to C
Follow vertical tool bar
Page 22
Step-by-step guide for data input - Developing a basic file
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Step 5 – D to E
Follow vertical horizontal tool bar
Page 23
Step-by-step guide for data input - Developing a basic file
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Step 6
Run the file and view results
Page 24
Step-by-step guide for data input - Developing a basic file
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Output facilities - Accuracy and reliability of Results
Page 25
oThe accuracy of the results from the program will reflect the accuracy of the input.
oFor a given capacity, the queue-length and delay predictions are the average values of broad distributions.
oWhere possible, the accuracy of the capacity and delay calculations for an existing junction may be improved by use of local traffic observations
oUse of the Analyser Screen will be of value to the user who is concerned with the robustness of a particular design.
oUse of the program should in general be limited to situations in which the values of the parameters involved lie within the range of values over which the relationships used have been calibrated.
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Output facilities - ARCADY Reports
Page 26
o Report Generator Customisable Built-in HTML Viewer (or view in any web browser) Can save as PDF or convert to a Microsoft Word file Sorting/grouping options Report is always up-to-date (automatically runs file)
o File Comparison system ARCADY lets you work with multiple files simultaneously Can compare inputs and outputs Differences between files/ results highlighted as a report
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Output facilities - Residual Capacity Mode
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o ARCADY can assess the network’s Residual Capacity.
o This is a measure of how much more traffic the system can cope with before a user-defined threshold is reached .
o If the system is already overcapacity, then the residual capacity indicates by how much the traffic would need to be reduced to restore satisfactory operation.
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Output facilities - Working with Results
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Results are generated when you run a file. There are several types of results, including:
o Results for each leg for each time segment (e.g. delay on leg 1 for time-segment ending 08:15)
o Results for each leg for the whole modelled period (e.g. average delay on leg 1 for 08:00-09:00)
o Results for all legs added together – these are available via the automatically totaling in Data Grid screens.
o Summary results for each Analysis/Demand set, shown in the Summary Results screen.
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Analysis of the outputs - Junction Diagram Screen
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Analysis of the outputs - Junction Diagram Screen – Queue overlays
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Analysis of the outputs – Printing, copying and exporting
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Analysis of the outputs – Analyser
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Analysis of the outputs – Optimiser
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o Enter a set of variables E.g. entry width and flare length on all arms Enter a range for each item
o Enter a set of targets E.g. VC on all arms < 0.85
o Press ‘Go’ Program will attempt to find values for the input items that satisfy the requirements (Not always possible!)
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Calibration
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• Never been attempt in UK to drive national / regional correction – ALWAYS SITE SPECIFIC
• Application of intercept correction – Adjustment made based on observed capacity, alters position of Qe.
• May be possible to derive regional / national factor based on average of many sites.
• Capacity adjustment can be made scales leg or intersection based on observations.
• Capacity adjustment can be made to take into account any effect, no matter how complex the intersection but is based in engineering judgement.
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ARCADY Roundabout Entry Lane Analysis mode
A
B
C
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ARCADY Roundabout Entry Lane Analysis mode
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Linking of junctions
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o Roundabouts are modelled jointly with the program performing all calculations
o It will model the affects of blocking back on upstream arms and transfer queues
o A ‘network’ of roundabouts can be modelled (queues may not be transferred due to exit restriction limitation)
o Any combination of roundabout types can be modelled
o It is easy to set up
o More time and cost efficient
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Other notable features
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o Bypass lanes and filter lanes
o Application of exit restrictions
o Ability to apply National / Regional calibration values
o Ability to personalize window layouts to suit user needs
o Audit trail
o Reading of demand data from excel
o Link to Autodesk JUNCTIONS, build roundabout in CAD and link to ARCADY updates results.
o Ability to predict probability of reaching user defined queue marker
o Ability to predict geometric delay
o Ability to predict safety (based on UK accident research)