New federal rules will make 30 km/h limits on main roads harder to introduce

The right-of-way rules will also change on 30 km/h roads open to general traffic. Priority to traffic from the right will no longer apply on these roads, a decision the Federal Council says should keep vehicles moving more smoothly. Pedestrian crossings will remain allowed, preserving an important tool for people crossing busy urban routes.

The adjustment separates speed management from the traditional priority rule used on many Swiss streets. Municipalities lowering a limit on a main road will therefore need to consider not only the speed signs, but also how intersections operate once the new rule takes effect. Clear road markings and communication will be important for drivers who are accustomed to the existing arrangement.

The government has abandoned another proposed condition. Municipalities will not have to give priority to low-noise road surfaces before introducing a 30 km/h limit. Such surfaces can reduce traffic noise more effectively than lower speeds in some circumstances, but they cost more. Cantons, cities and municipalities largely opposed making them a prerequisite.

That decision leaves councils with more flexibility over the tools they use to reduce urban noise. It also keeps the debate focused on the combined effects of speed, road design and traffic management. A lower limit can proceed without first funding an expensive resurfacing project, provided the municipality meets the new traffic displacement and assessment requirements.

Several Swiss cities have already lowered speeds on main roads, making the new rules immediately relevant. Fribourg, Lausanne, Sion, Zurich and Winterthur have introduced 30 km/h limits on stretches of main road. Some apply the limit at night, chiefly to reduce traffic noise, while others operate it throughout the day.

These measures have generated political disputes at both municipal and cantonal level. Centre-right parties in the Federal Parliament and in several cantonal legislatures have generally argued that main roads should retain the 50 km/h limit. Their position reflects the traditional role of main roads as routes for through traffic, public transport and access across urban areas.

Supporters point to road safety, public health and quieter streets. The existing city measures show that municipalities are not approaching the issue in one uniform way. A night-time restriction aimed at noise affects residents and drivers differently from an all-day limit linked to a wider redesign of the street.

Since 2023, residential neighbourhoods have been governed by a more permissive local framework. Councils can introduce 30 km/h limits there without expert assessments and without proving a specific safety or environmental problem. The new federal conditions draw a firm procedural line between those streets and main roads, where traffic displacement remains the decisive concern.

Swiss public opinion remains closely divided: 51% support expanding 30 km/h zones, while 46% oppose it. The figures come from an online RTS poll and show how little room there is for political shortcuts. Supporters most often cite health and road safety. Many opponents accept lower limits in some settings, but want main roads to retain the 50 km/h standard.

That distinction will shape the next round of municipal decisions. The federal rules do not prohibit lower speeds on main roads, and they do not require every municipality to keep the 50 km/h limit. They require councils to demonstrate that their choice will not create an undesirable shift of traffic into residential areas and to support the claim with an expert assessment.

The change will give local authorities a more demanding process to manage from 1 October. Councils considering a limit will need to map surrounding routes, evaluate likely driver behaviour and explain how intersections and crossings will function. Residents can expect the debate to continue through planning hearings, council votes and consultations.

The result will likely vary by city and road. A quiet residential district, a commercial corridor and a transit-heavy urban avenue carry different pressures. Federal rules now require municipalities to document those differences before placing a 30 km/h limit on a main road.