Introduction
Bologna’s citywide 30 km/h limit has become a national reference point for debates about road safety, traffic flow, economic impacts and public acceptance. Ongoing legal disputes highlight the need for a governance model that combines evidence, structured listening and targeted adjustments.
The Concorder proposal “Bologna Città 30: confirm, correct or redesign the limits?” provides a practical framework: clarify the perimeter, publish data, define exceptions with transparent criteria and combine technical evidence with public deliberation.
This article turns that proposal into a step-by-step guide for a shared and evidence-based City 30.
Why it matters
Citywide speed limits sit at the intersection of safety, public health and urban mobility. Key evidence:
- Road safety: the European Transport Safety Council reports that 30 km/h zones reduce severe crashes by 20–40%.
- Air quality: the European Commission notes that smoother driving patterns reduce NOx and particulate emissions.
- Public health and noise: WHO research links lower speeds with measurable noise reductions in dense urban areas.
- Urban quality: City 30 schemes integrated with active mobility often support local businesses and improve walkability.
Local data published by BolognaCittà30 confirm reductions in crashes and increased cycling levels, while highlighting specific areas where traffic flows need recalibration.
How it works: a data-driven, participatory method
A stable and accepted City 30 requires a structured process built around five steps.
Step 1 – Clarify scope, goals and evaluation criteria
A clear starting point includes:
- which streets remain at 50 km/h and why (function, transit role);
- objectives and measurable indicators (crashes, speeds, emissions);
- stakeholders affected: residents, taxi drivers, shop owners, schools, logistics.
Step 2 – Collect and publish data
- before/after crash trends;
- real speed measurements;
- traffic volumes and peak-hour patterns;
- public transport performance;
- air-quality indicators (regional monitoring networks).
The EU Urban Mobility Framework emphasises that transparency around evidence is key to public acceptance.
Step 3 – Structured listening with stakeholders
International experience shows that 30 km/h limits work best when dialogue includes:
- topic-specific meetings (safety, logistics, schools, commerce);
- neighbourhood tables in affected areas;
- digital participation through platforms like Concorder.
Step 4 – Targeted adjustments and exceptions
- maintaining 50 km/h on strategic corridors;
- strengthening City 30 around schools and residential areas;
- fixing missing cycling links or unsafe junctions;
- time-based logistics windows.
Step 5 – Final deliberation and monitoring
A credible City 30 includes:
- a motivated final decision on the perimeter;
- semi-annual monitoring with public dashboards;
- clear, time-bound commitments on safety, flows and emissions.
Use cases and transferable lessons
- Residential districts: strong safety gains and calmer streets.
- Local businesses: improved accessibility for pedestrians and cyclists.
- Metropolitan coordination: consistent rules across municipalities reduce confusion.
How Concorder helps
Concorder supports complex processes like City 30 through:
- structured proposals and comparable scenarios;
- deliberative workflows with consultation, amendments and voting;
- moderated discussion spaces for sectors, neighbourhoods and experts;
- transparent voting on exceptions and priority corridors;
- AI-generated minutes for clarity and accountability;
- monitoring dashboards for long-term indicators.
Conclusions and CTA
A 30 km/h citywide limit can be a stable, effective and widely accepted measure — provided it is grounded in data, dialogue and transparent decisions. Concorder offers the digital infrastructure to make this process possible.
👉 Want to explore how Concorder can support your City 30 approach?
Discover all the features at concorder.net or book a free demo.
