4 data sources cross-referenced in a single platform: police collisions (Traxy), fire-service collisions (SDMIS), hard braking and speeding from connected vehicles. 5 years of collision records analysed around the junction, 2021–2025. 6 months from the first analysis map built on Vianova to works starting on site. €100,000+ funded by the 8th arrondissement town hall from its local works budget.

The Background

The Métropole de Lyon has been committed to Vision Zero for several years, targeting zero deaths and zero serious injuries on its roads by 2050. It has worked with Vianova and the VIP platform for more than three years towards that goal. In Lyon, residents, local shopkeepers and parents from the neighbourhood school wrote to elected representatives at the Métropole to warn about the danger of the two pedestrian crossings on rue Marius Berliet, at the junction with rue Saint-Gervais. The Métropole's road safety unit was asked to run a study: to put numbers behind the insecurity people were reporting, and to help find a solution.

The Challenge

Find a street design intervention that could:

• bring speeds down on rue Marius Berliet;
• make the two pedestrian crossings more visible and safer to use;
• stay compatible with the high-frequency bus route running along rue Marius Berliet;
• fit the budgets actually available for roadworks.

The Solution

Vianova opened an analysis zone around the junction so the study could start straight away. On the platform, Quentin was able to:

• layer five years of police and fire-service collision records, and attach each one to a specific street segment;
• sort casualties by age and by mode — pedestrians, cyclists, scooter riders;
• spot moderate and severe speeding, and hard braking events, segment by segment and hour by hour.

The Results

The decision was taken on the strength of that study.

• The data showed that pedestrian priority was not being respected, that motor vehicles were travelling too fast and behaving dangerously, and that the crossing generally lacked visibility. In 2025 alone the platform recorded 2 hard-braking events on the junction itself and several hundred severe speeding events — more than 20 km/h over the limit — on the approach to it.
• Quentin presented the study to the Métropole's roads department and to the 8th arrondissement town hall, with several recommended interventions, including a raised speed table. The Métropole and the town hall agreed on that option: the table stays crossable for buses, and the pavements are brought back up to level to mark pedestrian priority more clearly.
• Residents approved the project at a public meeting, and the 8th arrondissement town hall funded it from its remaining local budget.
• Only one year passed between the residents' letter of warning and the end of the works.

"On the VIP platform, I was able to cross-reference collisions from the police and fire-service databases with speeds and hard-braking events from connected vehicles, and produce a complete study of the junction. I then completed it with on-site observations of the infrastructure and of road-user behaviour. I presented the study to my colleagues in the roads department and to the 8th arrondissement town hall, who took it up to choose the most coherent intervention. A few months after the study, the works began." — Quentin Boisson, Road Safety Studies Officer, Métropole de Lyon

The Future

Once the speed table is in place, the Métropole can keep tracking collisions at the junction and compare speeds and braking before and after.

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