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A1 Expansion 2027

Aarau-Ost–Birrfeld and Perly–Bernex will become six-lane highways

With the “Transport ’45” project, the federal government aims to expand the A1 in a targeted manner. Two projects are scheduled for the 2027 expansion phase. Between Aarau-Ost and Birrfeld, the highway will be expanded to six lanes. The Perly–Bernex section near Geneva will also become six-lane. Both projects are intended to eliminate bottlenecks.
Sechsspuriger Ausbau Aarau-Ost–Birrfeld. Six-lane expansion of the Aarau-East–Birrfeld section. Élargissement à six voies du tronçon Perly–Bernex près de Genève.
© iStock
THE KEY POINTS IN BRIEF
• In the 2027 expansion phase, the A1 between Aarau-Ost and Birrfeld will be expanded to six lanes.
• The Perly–Bernex section near Geneva will also become six-lane, relieving pressure on the urban road network.
• By 2045, the federal government plans eight additional sections and is focusing on targeted interventions.

Six-Lane Expansion of Aarau-Ost–Birrfeld

The first bot­tle­neck is in the can­ton of Aar­gau. Traf­fic fre­quent­ly backs up between Aarau-Ost and the Bir­rfeld inter­change. That is why this sec­tion is being expand­ed to six lanes. This will improve the east-west cor­ri­dor between Zurich and Bern. At the same time, it will reduce the amount of traf­fic divert­ing into near­by vil­lages.

Six-Lane Expansion of the Perly–Bernex Section Near Geneva

The sec­ond project is locat­ed in the can­ton of Gene­va. The Perly–Bernex sec­tion is over­loaded. The expan­sion will relieve pres­sure on the urban traf­fic net­work by elim­i­nat­ing a bot­tle­neck on the high­way bypass. This will ben­e­fit the entire region.

More Than Just Additional Lanes

Both projects offer added val­ue. They will facil­i­tate future main­te­nance work, ensur­ing that nation­al high­ways remain more acces­si­ble. Addi­tion­al­ly, they will improve the effi­cien­cy of resource allo­ca­tion. The fed­er­al gov­ern­ment is thus pri­or­i­tiz­ing areas where the pres­sure is great­est.

Eight Additional Sections by 2045

The 2027 expan­sion phase is just the begin­ning. The fed­er­al gov­ern­ment plans eight addi­tion­al sec­tions by 2045. It is focus­ing on tar­get­ed inter­ven­tions rather than blan­ket cov­er­age. The arti­cle on the list of projects to be scrapped shows which projects will be dropped.

On the future of mobil­i­ty

Special Feature: “Transport ’45”

This arti­cle is part of the “Trans­port ’45” spe­cial series. In this series, we pro­vide an overview of Switzerland’s major trans­porta­tion pro­gram through 2045. We exam­ine the expan­sion of rail and road net­works, com­muter trans­porta­tion, and financ­ing. Each part delves deeply into a spe­cif­ic top­ic while remain­ing easy to under­stand on its own. You can find the com­plete overview and all oth­er arti­cles on our “Trans­port ’45” overview page .
Which A1 sec­tions will be expand­ed?

The 2027 expan­sion phase includes the Aarau-Ost–Birrfeld and Perly–Bernex sec­tions. Both will be widened to six lanes.

The projects are part of the 2027 expan­sion phase. The pro­pos­al is open for pub­lic com­ment through Octo­ber 2026.

this page has been automatically translated.

Picture of Michael Gehrken

Michael Gehrken

Michael Gehrken has been firmly established in the Swiss mobility landscape for many years – as a communicator, association director, and strategic thinker. After starting out as a journalist, he moved to the federal administration, where he initially worked as head of communications at the Federal Roads Office (FEDRO) and later as co-responsible for NEAT communications at the Federal Office of Transport (FOT). From 2006 to 2014, he was director of the Swiss Commercial Vehicle Association ASTAG, where he had a significant influence on industry communications. Today, as president of L-drive Switzerland, the umbrella organization for Swiss driving instructors, he is at the forefront of an important voice in the field of road safety and training. With the mobility-360.ch platform, Michael Gehrken is committed to independent, fact-based, and forward-looking reporting on all aspects of mobility—from new technologies to social developments. His writing combines experience in politics, business, and practice with a clear vision of the mobility of tomorrow.
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