Viaduc de Sylans, Truss bridge in Le Poizat-Lalleyriat, France.
The Sylans Viaduct extends 1266 meters across a mountainous slope, connecting the regions of Mâcon and Annemasse through the A40 motorway.
Engineers Pierre Richard and Bogumil Serafin designed this concrete structure in 1989, incorporating external prestressing techniques for enhanced stability.
This viaduct represents a significant advancement in French infrastructure development, connecting communities in the Ain department of Auvergne-Rhône-Alpes.
The bridge carries the A40 motorway, also designated as routes E21 and E62, providing direct access between Mâcon and Saint-Gervais.
The structure features a three-dimensional external prestressing system, which stands as an engineering innovation for its construction period.
Location: Le Poizat-Lalleyriat
Location: Charix
Inception: 1989
Length: 1,266 m
GPS coordinates: 46.16190,5.65500
Latest update: June 23, 2025 09:50
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