LinSig Version 3.2
Detailed features & capabilities
Although LinSig started life as a design and modelling tool for individual traffic signal junctions it has been extended and improved many times to now be a fully fledged modelling tool for networks of signals as well as retaining the ability to model single junctions.
A central idea behind LinSig is that it models traffic signal junctions in a similar way to how a real traffic signal controller actually works. This means that LinSig takes account of the features and constraints of the controlling equipment, thereby ensuring that all modelling accurately reflects how existing junctions work, and how any design proposals would operate if implemented.
LinSig 3.2 key features
LinSig provides many modelling features the most important ones being:
- Controller Model.
A sophisticated Controller Model based on the UK Department for Transport TR2500
specification capable of modelling multiple stage streams. LinSig 3 can model
multiple controllers within a Network which can be coordinated or have different
- Detailed Traffic Model.
A traffic model which models the detailed behaviour of traffic on each lane providing
predictions of capacity, delay and queuing. LinSig 3.1 includes a radically improved
more flexible model than previous versions and removes the requirement to group lanes
into links allowing independent control of short lanes and automatic modelling of
short lane blocking.
- Network Capable Traffic Model.
LinSig's traffic model can model both single junctions and networks. When used to
model a network coordination between junctions is modelled in detail. LinSig 3.1
greatly increases modelling flexibility by allowing a model to be split into regions
with each region being modelled using the most appropriate method rather than the
one size fits all approach of previous versions. LinSig will typically model networks
of up to 10-15 junctions using a highly detailed matrix based approach and upto 20-30
junctions using the new lane based flows approach introduced in LinSig 3.1.
- Multiple Flow Entry Options
LinSig provides two alternative methods of entering traffic flows. The more detailed
matrix based method allows flows to be defined as a network wide origin-destination
matrix with the ability to model rerouting due to changes in delays in the network
and highly detailed modelling of traffic signal coordination. Lane based flows
provides a simpler option which allows flows to be entered lane by lane without
the requirement for an OD matrix but is potentially less accurate and cannot model
- Graphical Traffic Count Management
LinSig uses traffic turning counts to estimate a network origin-destination matrix.
Turning counts can managed graphically which allows poor quality counts or consistency
errors to be quickly located and rectified.
- Right Turn Model.
LinSig includes a particularly sophisticated right turn model which allows the
operation of right turns, whether opposed, unopposed or a combination, to be
modelled in considerable detail. Right turn capacity is often a crucial determinant
of overall junction capacity and it is important to correctly model all of the subtle
aspects of a right turn.
- Bus Modelling
Seperate modelling of bus traffic allows signal timings to be optimised taking
into account custom bus cruise and stopping times. Seperate delay and journey time
outputs are available for buses or any other similar class of traffic such as trams.
- Model Auditing.
LinSig includes a model audit view which as well as allowing key model information
to be viewed in a common format in one place allows different LinSig scenarios or
files to be compared and differences highlighted.
- TRANSYT Compatibility.
Except when LinSig's more sophisticated modelling options are used, LinSig can
produce numerically equivalent results to TRANSYT PDM models for the same signal
times. This allows comparison and validation against existing modelling work before
optionally going on to use LinSig's advanced features to improve the model.
- Pedestrian Modelling.
LinSig can optionally model pedestrian delays and linking through each junction.
LinSig also models control related pedestrian issues in its controller model.
- Signal Optimiser.
A Signal Optimiser which optimises traffic signal stage/phase durations taking into
account constraints of the control mechanism. The optimiser can optimise junctions
individually or over the whole network.
- Equilibrium Assignment of OD Matrix.
Traffic Flow data can be defined using an Origin-Destination matrix and assigned
automatically to Routes through the junction or group of junctions. LinSig 3 includes
a sophisticated assignment method based on user equilibrium assignment as used in
larger strategic transportation models.
- Matrix Estimation.
Where no Origin-Destination matrix exists for a network LinSig can estimate a 'best fit'
matrix from traffic turning counts. This allows more sophisticated matrix based modelling
methods to be used even where it is not feasible to directly count the OD matrix.
- Merging of Networks.
Individual junction models, whether built in LinSig 3 or previous versions, can be
joined together to form larger networks.
- SCATS™-based controller model
Controller data can be specified in a form consistent with SCATS™ controllers. Phase timings
can be entered via minimum green, early cut-off green and yellow plus all-red durations, and the
behaviour of Signal Groups in between successive Phases can be defined using the Phase
Overlaps view. Timings of pedestrian Signal Groups are specified via walk time and clearance
durations, and traffic Signal Groups can be configured to run with pedestrian
- Additional features for users in Australia and New Zealand
As well as the SCATS™-based controller model, traffic flows can be imported from detector
data output by the SCATS™ Traffic Reported program, two-lane flared right-turns can be modelled,
and junction and network performance can be indicated as a Level of Service value.
- TranEd 2 Import
TRANSYT models prepared using TranEd 2 can be imported into LinSig and in most cases
will run and give results immediately after importing with no further work.
- Bonus Greens
Bonus Greens can be used to calibrate models to a wide range of conditions such as under
utilised green time, demand dependancy, blocking back and partially protected pedestrians
outside the UK.
- Batch Optimisation of Multiple Scenarios.
Multiple modelling scenarios can be defined by associating traffic flow groups and signal
sequences. These can then be calculated or optimised in batches allowing rapid recalculation
of results after making changes to the model.
- Stage Sequence Library.
Each junction can have a library of stage sequences defined which can be easily reused
at any point. With LinSig 3 Stage Sequences can be further combined into Network Control
Plans which specify the signal control for an entire network.
- Phase Based Design.
Unique graphical Phase Based Design Editor which allows signal sequences to be designed
based on Phases alone. This process can often allow a more efficient stage sequence to
be designed. LinSig's Phase based Design tool assists with the design process whilst requiring
enough input from the engineer to ensure a sound practical stage sequence.
- Multiple Flow Groups.
Multiple flow groups can be defined for different time periods or development scenarios.
Component flow groups can be combined using flow group formulae allowing flexible calculation
of future or proposed traffic flows.
- Cycle Time Optimisation.
A range of cycle times can be graphically analysed and the optimum selected.
- Interstage Optimisation.
Interstage optimisation can be carried out either interactively using the Interstage
View or by using LinSig's interstage optimiser.
- SCOOT/UTC Calculator.
A SCOOT Database Configuration Calculator to assist with the preparation of data for
SCOOT or UTC databases.
- Report Generator.
A Report Generator which produces detailed customisable reports, including graphics and
tables, in RTF format which is compatible with MS Word and most other word processors.
- Link Bandwidth Display.
The Junction Layout View can display traffic flows as bandwidths providing a clear
summary of where how traffic is passing through the network.
- Network Animation.
Animation of Signal Timings and Queues. Signal Timings and queues can be animated on the
Junction Layout View, Phase View and Signal Timings View.
- Export to CAD.
Graphics can be exported to DXF for import into AutoCAD and other CAD software.
- View Manager.
Arrangements of LinSig Views can be saved allowing screen layouts to be easily changed.
- Embedded Notes on the Network Diagram.
Networks can be annotated using 'Post-It' notes embedded in the Network Diagram.
- Timing Dials.
Timing Dials provide an easy way of adjusting signal timings directly from the Junction
Layout View and are very useful for the interactive optimisation of signalled roundabouts
for maximum entry capacity.
Further information on LinSig
We aim to provide all the information you need to fully evaluate LinSig before deciding whether to purchase. Some aspects you may need more information on include: