LinSig 3

LinSig 3 contains a sophisticated Controller Model based on the UK TOPAS 2500 specification capable of modelling multiple stage streams. The software can model multiple controllers within a Network which can be coordinated or have different cycle times.

Our traffic model models the detailed behaviour of traffic on each lane providing predictions of capacity, delay and queuing. LinSig 3 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.

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 will typically model networks of up to 10-15 junctions using a highly detailed matrix based approach and upto 20-25 junctions using a lane-based flows approach.

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 routing effects.

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.

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.

Separate modelling of bus traffic allows signal timings to be optimised taking into account custom bus cruise and stopping times. Separate delay and journey time outputs are available for buses.

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.

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.

LinSig can optionally model pedestrian delays and linking through each junction. LinSig also models control related pedestrian issues in its controller model.

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.

Traffic Flow data can be defined using an Origin-Destination matrix and assigned automatically to Routes through the junction or network. LinSig 3 includes a sophisticated assignment method based on user equilibrium assignment as used in larger strategic transportation models