LinSig

LinSig was developed in the UK by Brian Simmonite in the 1980s who went on to set up JCT Consultancy. The software has been updated a number of times during its life.

LinSig was first written in the mid-1980s as a DOS-based tool for analysing and optimising single traffic signal junctions. The use of the software spread mainly by word of mouth within the traffic signals profession becoming widely used by signal engineers. The LinSig traffic modelling was based on standard 'Y' value hand calculationsBangladesh Roads and Highways Department

- Paragraph 5.30 http://www.rhd.gov.bd/Documents/ExternalPublications/Trl/Calculation%20of%20traffic%20signal%20timings-Webster's%20method%20Note13.pdf http://www.rhd.gov.bd/Documents/ExternalPublications/Trl/Calculation%20of%20traffic%20signal%20timings-Webster's%20method%20Note13.pdf which were widely used at the time for manually calculating traffic signal capacities and delays. This allowed the results of the software to be easily checked against existing manual calculations.

LinSig for Windows Version 1 retained the same modelling capabilities as the earlier DOS versions but provided a Windows interface. This version also introduced graphical diagrams into the software showing information such as the junction's lane layout and the phasing and staging arrangements.

LinSig Version 2 was the first version of LinSig to allow the modelling of more than one junction.http://www.jctconsultancy.co.uk/Home/docs/JCT_LINSIG2_Joined_Up_Modelling_TEC_Article_Sep2006.pdf Joined Up Traffic Modelling with LINSIG V2. TEC Journal. September 2006. Paul Moore A new network traffic model was introduced which allows the coordination of closely spaced traffic signal junctions to be modelled.

LinSig 3 changed from a link-based model to a lane-based model.JCT Consultancy, LINSIG 3 User Guide It also allowed the user to model larger networks and provides new network modelling tools such as delay-based traffic assignment and entropy-based trip matrix estimation. Using this software it is possible to model signalised roundabouts.http://www.jctconsultancy.co.uk/Home/docs/JCT_LinSig_for_Signalled_Roundabouts_Symposium_2007.pdf LinSig for Signalled Roundabouts. JCT Symposium, Nottingham, September 2007 Dr. Douglas Reid, Brian Simmonite

LinSig uses a development of the Cyclic Flow Profile traffic model which has been used extensively in the UK for many years. The Cyclic Flow Profile Model simulates the interaction between closely space junctions allowing coordinated signal timings to be modelled.

LinSig input data includes observed traffic flows, traffic signal controller phases and stages, time between green signals,Traffic Signs Manual Chapter 6 https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/851465/dft-traffic-signs-manual-chapter-6.pdf saturation flowshttp://www.trl.co.uk/online_store/reports_publications/trl_reports/cat_traffic_engineering/report_the_prediction_of_saturation_flows_for_single_road_junctions_controlled_by_traffic_signals.htm Research Report 67 - The prediction of saturation flows for single road junctions controlled by traffic signals, Kimber, TRL and lane lengths.

Pedestrian delays at signal junctions can be modelled for individual or linked crossings.

LinSig optimises signal timings either to maximise traffic capacity or minimise delay at a junction.

LinSig can model and optimise networks of several junctions as well as individual junctions. It is designed to model small groups of junctions in detail rather than larger networks covering entire towns.

LinSig uses a traditional user equilibrium assignment to assign traffic to routes through the network based on delays calculated by the network model.

LinSig provides a matrix estimation facility to generate a network wide trip matrix from junction turning counts. This uses a combination of traditional entropy-based estimation methods together with customisations targeted at estimating matrices in smaller networks.

The main competitor within the UK marketplace is TRANSYT.

• Traffic light control and coordination

{{reflist}}

• [http://www.jctconsultancy.co.uk/ JCT Consultancy]
• [https://trlsoftware.co.uk/products/junction_signal_design/transyt Transyt]

Category:Road traffic management

Category:Road transport in the United Kingdom

Category:Traffic signals

Category:Traffic simulation