Seville's SE-40 Bridge: Spain's Longest Road Bridge to Ease Traffic 2026

Seville's long-awaited SE-40 megabridge is set to become Spain's longest road bridge and, very likely, the highest in Europe. The project has official approval and a budget, but as with many large infrastructure projects, time is the missing ingredient.

Decades of Traffic Problems on the SE-30

The SE-40 ring road has been a pending issue in Seville for years. Of the planned 75 kilometers, only 38 are currently in service. The missing section—the most difficult one—must cross the Guadalquivir River southwest of the city, between Dos Hermanas and Coria del Río.

Until this connection is built, traffic continues to be diverted to the SE-30, a road where congestion builds daily. Ironically, the SE-40 was conceived precisely to solve this problem.

Why the Project Took So Long to Start

For nearly two decades, the project was stalled due to disagreement over whether to build an underwater tunnel or a bridge over the Guadalquivir. The tunnel option was eventually discarded due to its enormous technical difficulty and exorbitant cost.

According to El Confidencial, the failure of that plan left behind a tunnel boring machine valued at 37 million euros that sat unused for over a decade and was eventually sold for just 1.8 million. The Ministry of Transport ultimately opted for the bridge.

Key Features of the SE-40 Bridge

• Length: 3.5 kilometers, making it the longest road bridge in Spain.
• Height: Likely the highest clearance of any bridge in Europe.
• Location: Crosses the Guadalquivir between Dos Hermanas and Coria del Río.
• Purpose: Completes the SE-40 ring road and relieves pressure on the SE-30.
• Status: Officially approved with budget allocated; construction timeline pending.

Comparison: SE-30 vs. SE-40

What the Bridge Means for Seville

Once completed, the SE-40 bridge will provide a direct route for traffic that currently funnels onto the SE-30, significantly reducing congestion. It will also improve connectivity between Dos Hermanas and Coria del Río, two growing municipalities.

The bridge's exceptional height will allow ships to pass underneath, maintaining navigation on the Guadalquivir. This feature is crucial for the Port of Seville, which relies on river access. The background to this story is set out in M-501: Madrid's Longest Road and Its Eternal Gridlock Problem. A related thread runs through Awaiting Approval vs Pending Approval: Which Phrase Wins at Work. Earlier coverage in Awaiting approval vs pending approval: the phrase most people get shows how the argument developed.

What to Watch Next

The project has the green light and funding, but construction has not yet begun. The next milestones will be the tender for construction and the start of works. Given the scale, experts anticipate a multi-year timeline. A closer look at the same subject appears in Solar Panels in Seville Become a Surprising Refuge for Birds of Prey. Anyone following the wider picture can start with Seville Police Hunt Suspect After Assault Rifle Found in Trash. The same theme surfaces in Seville Horse Carriage Black Market: Nearly All Drivers Undocumented, which takes a different angle.

For now, drivers in Seville will continue to face daily traffic jams on the SE-30. The megabridge promises relief, but patience will be required. Context on how this played out before sits in Brenner Base Tunnel: Europe's Longest Railway Tunnel Project. A companion piece, Car: latest articles, approaches the same subject from another angle.