SATURN the professional choice

1
SATURN - the professional choice

• Whatever your traffic modelling needs
• traffic congestion solutions
• revised traffic management arrangements
• by-pass or town centre relief
• development impact
• local junction improvements
• forecasting the impacts of traffic growth
• assessing induced traffic
• impact of capacity reductions
• looking at vehicle emissions
• economic or environmental assessment
• .SATURN can help

2
SATURN - the flexible solution

• From tolling to traffic management, from a
  handful of junctions to full Regional studies
  with thousands of junctions, SATURN gives you the
  tools for the job.
• The complete State of the Art Assignment Package
• Fully compatible Public Transport and Demand
  suite SATCHMO also available

3
SATURN

• Simulation and Assignment of Traffic in Urban
  Road Networks
  
• Road Network Planning in Congested Areas
• Detailed Network and Junction Graphics
• Technically Highly Respected
• Continuously Developed since 1976 by Leeds
  University Institute for Transport Studies
• Proven Track Record
• Over 300 users
• Many thousands of applications to date

4
SATURN has the answer

• A multi-featured traffic modelling suite, SATURN
  has been used in thousands of studies worldwide
• SATURN features
• Combined Simulation and Assignment for detailed
  representation of traffic behaviour
• Interactive Network Building and Editing
• Compehensive Graphical Display and Analysis
  options
• Advanced Matrix Manipulation facilities
• Matrix Estimation from Counts

5
Matching Demand with Supply
SATURN
Supply
Demand
Road Network
Trip Matrices
Assignment
Actual flows
6
Structure of SATURN
Build Network Interactively
Perform Integrity Checks
Create Trip Matrix
Assign Trips to Network
Analyse Results
7
Networks in SATURN

• Range of User-specified Parameters
• Two Levels of Network Coding
• Simulation - Detailed - Junction Based
• Buffer - Link Based
• Centroid Connectors
• Co-ordinates
• Multiple Count Data Sets
• User-Class Specific Values of Time
• Comprehensive Error Checking

8
PMAKE network builder

• Build from blank screen or over PCX file
• Mouse based
• Node, Zone and Link definition
• Link splitting
• Conversion from buffer to simulation
• Link/node deletion

9
Interactive network building
Node positions and links defined using mouse
10
Convert buffer to simulation
Choose node and type - then add detail
11
Defining signal stages
Click on turn in banner to create stage movements
12
SATURN Assignment Options

• SATURN supports a wide range of assignment
  options including
• Equilibrium
• Stochastic User Equilibrium
• All-or-nothing
• Stochastic
• Up to 32 User Classes Supported
• Full Demand Responsive Options Available
  (Elastic Assignment)

13
Demand Responsive Assignment

• Whereas conventional assignment deals only with
  the routeing of fixed demand through a network
  ,SATURN can also allow demand to change in
  response to cost changes
• Such an elastic assignment mechanism allows the
  user to investigate and forecast
• realistic levels of future year traffic where
  congestion is already a problem
• levels of traffic Induced by improvements
• likely impacts of Road-space Reduction policies
  eg. as associated with PT priority measures

14
Simulation in SATURN

• Models detailed flow interactions
• Cyclic Flow Profiles (CFPs)
• Platoon Dispersion
• Delays take account of
• Gap Acceptance for Give-way/Stop Lines
• Individual Turn Saturation Flows
• Lane/turn Allocations
• Signal Timings and Offsets
• Blocking Back between junctions
• Full Range of Junction Types

15
Simulation in SATURN

• Queueing
• Permanent and transient queues represented
• Multiple Time Periods through SATTPX
• Flow Metering
• Flow downstream is restricted by entering turn
  capacities
• Banned Turns
• Public Transport
• Bus Routes and Frequencies
• Bus Only Lanes and Turns

16
Interactive Analysis in SATURN

• P1X - Graphics
• Network Displays and Analysis
• Link and Turn Annotation
• Trees
• Select Links
• GIS representation etc
• Node Graphics and Editing
• SATDB Data-Base Options
• SATLOOK Report Generator
• KEY files for repeated tasks

17
P1X network displays
18
P1X Options

• A vast range of display options is available so
  that users can tailor the output to their
  specific needs. Options allow for
• Multiple Networks
• Display of Results
• Windowing
• Link and turn annotation
• Comparisons/differences
• Numerical and geometric displays
• Analysis Options

19
Window control
Mouse based windowing
20
Link and Junction Annotation
Both Geometric and numerical annotation options
for links and junctions are supported
21
Network comparisons
Bandwidth plot of flow differences
22
Turning movement annotation
23
GIS Backgrounds for Impact
24
Individual Junction Plots
Display of turning flows as tubies with
bandwidth related to volume
25
Lane allocations and speeds
Junction layouts at either network or node level
26
Link Annotation
Multiple choice annotation - selection using mouse
27
Problem junctions?
28
Validation Options
Plots of counts against flows are useful in
validation
29
Journey time plots
Cumulative and link times and distances shown
30
P1X Analysis Options

• P1X allows the user to gain a deeper
  understanding of traffic flows through a range of
  analysis options including
• Trees/forests
• Select Links
• Information
• Cordoning
• Joy rides

31
Select link reassignments
Here the paths of all trips crossing a strategic
bridge are shown
32
Trees and Forests
Forests show routes taken from an origin zone to
a destination
33
Bus route information
34
On-screen Cordon Selection
Networks and matrices for sub-areas can be output
35
Isochrones for accessibility
36
P1X Options

• Also available through P1X are
• SATED node editing
• Change or define simulation nodes
• SATLOOK report generator
• Summary statistics
• Cost skims
• Count comparisons
• SATDB data-base manipulation
• Data creation
• Part matrix re-assignment (SATRAP)

37
Interactive junction editing
Current turn highlighted for enhanced
user-friendliness
38
Defining bus routes interactively
39
NT Version
40
Concurrent runs under NT
41
MX Matrix Manipulation

• MX provides facilities to build and modify Trip
  Matrices with options for
• FORTRAN type operations
• Factoring
• Combining
• Transposing
• Screen Editing
• Furnessing
• Compressing / Disaggregating Zones
• Matrix Reduction

42
Auxiliary Programs

• The SATURN suite also includes the following
  auxiliary modules
• SATPIJA and SATME2 for Matrix estimation from
  count data
• SATOFF signal offset optimiser
• SATSUMA to combine multiple time period models

43
Versions of SATURN

• The standard version of SATURN is Level B which
  supports
• 400 zones
• up to 499 simulation nodes
• up to 7500 assignment links
• Costs for Level B are from 7250 (8250 non-UK)
  for a multi-machine site or organisation/country
  licence
• Maintenance is available for 15 percent per annum
  based on prevailing list prices
• Larger versions are available on request

44
SATURN Contacts

• For further information on SATURN or to order,
  contact
• Mike Hall
• WS Atkins
• Woodcote Grove
• Ashley Road
• Epsom KT18 5BW
• England
• Tel [phone] ext 6397
• Fax [phone]
• Email mhall_at_wsatkins.co.uk

45
SATCHMOfor your Multi-modal needs

• Featuring
• SATURN compatibility
• Demand and mode-split modelling
• Conventional and incremental distribution and
  mode choice
• Public Transport network building and assignment
• Joint mode-split and assignment
• Simultaneous mode-split/distribution and
  assignment

46
SATCHMO

• Towards an integrated transport solution
• SATCHMO PT assignment allows you to
• evaluate public transport networks and service
  levels
• examine routeing options
• determine route loadings
• skim pt costs
• SATCHMO demand modules for
• finding that balanced solution

47
Network Plotting in SACHP1
48
Bus ridership displays
49
Public Transport Tree Plots
50
DRACULA micro-simulation

• Junction or network representation
• SATURN interface
• Behavioural base
• Car following
• Lane changing
• Vehicle types
• Detector facility
• Operational evaluation
• ITS applications

51
DRACULA modelling
52
SATWIN (Main Screen)
53
SATURN MODULES
54
SATCHMO MODULES
55
DRACULA MODULES
56
SATURN Test Run
57
SATURN Batch Runs

• You can
• View and edit batch files.
• Save batch files.
• Select and run previously saved batch files.

58
COMMAND LINE RUNS
59
Recent Features
60
Recent Features
61
Recent Features
62
Recent Features