LinSig signal modelling.
Signal junction and network modelling in LinSig, validated against observed queues and signal timings from the highway authority.
Also known as: LinSig, traffic signal modelling, signal junction capacity, degree of saturation, practical reserve capacity
What’s included.
LinSig models signal-controlled junctions and linked networks. Results are reported as degree of saturation, practical reserve capacity, queues and delay. Signal timings usually come from the highway authority’s signals team.
- Signal timings and phasing from the council
- Single junctions and linked networks
- Base model validation
- Future year and mitigation scenarios
- Pedestrian and cycle stages
- Clear results tables
Straightforward, proportionate, agreed early.
Right data
Controller timings from the council, not assumptions.
Validated
Queues and saturation checked against what is seen on site.
Every user
Pedestrian and cycle stages modelled, not left out to flatter the results.
Questions we get asked
What is practical reserve capacity?
How much more traffic a signal junction could take before reaching 90% degree of saturation on its busiest approach. A negative value means it is over practical capacity.
Where do signal timings come from?
From the highway authority’s traffic signals team, usually on request.
Can LinSig model several linked junctions?
Yes, as a network, which matters where junctions are close together.
Often needed alongside.
What a LinSig model shows
LinSig models signal-controlled junctions and linked signals. It tests how a junction performs with the development traffic added, and whether changes to timings or layout would help.
A model is only as good as its inputs. We get the current signal timings from the highway authority and check the model reproduces the queues seen on site before using it to test the future.
- Degree of saturation for each lane, with around 90% usually treated as practical capacity.
- Practical reserve capacity for the junction as a whole.
- Mean maximum queues and delay, compared with and without the development.
Last reviewed October 2026 by Ripple Development Planning. Policy and guidance change; for advice on a specific site, send us the details.
From our insights.
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