The Low-Traffic Neighbourhood Tool

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Try it: a-b-street.github.io/ltn and cnt.scot

Code: github.com/a-b-street/ltn

User guide: cnt.scot/user_guide

About

LTNs are a traffic management measure to stop excessive through-traffic cutting through residential streets. The public consultation process on their design heavily involves residents, and the LTN tool was created to make the process of placing modal filters intuitive and rapidly explorable.

Start by deciding the boundary of your LTN. In Scotland, you can prioritise by factors like population density, car ownership, and land use mix.
Place new modal filters until a new cell forms, ensuring shortcutting traffic does not just reroute a different way through the neighbourhood.
Quickly explore how driving journeys will differ.

Working with the stakeholder

The LTN tool has gone through several iterations. The first version was built in conjunction with Bristol City Council, used in a liveable neighbourhood consultation, which included in-person workshops.

The current version, called the Connected Neighbourhood Tool, was developed with the Sustrans mobility team, funded by Transport Scotland. The Scotland version is undergoing internal review before launch, while the global version is launched and ready for use. The tool has also benefited from significant feedback, testing, and co-design with members of the OpenStreetMap community and cycle campaigning volunteers in France. By making a useful tool available worldwide and for free, this sort of organic evolution and coordination happens.