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Hessen Mobil is setting up a temporary traffic light system for approximately two weeks – reopening to traffic is planned for the end of 2026
OBER-RAMSTADT – As part of the construction of the Ober-Ramstadt/Hahn bypass, Hessen Mobil will begin further work on the B 426 on Monday, September 29, 2025. The roadway will be widened at the level of a newly constructed retaining wall. For this purpose, the road construction authority will implement a partial road closure with traffic light control .
Traffic management during construction work
The traffic management plan will remain in place for approximately two weeks. After that, traffic will be routed past the construction site in two lanes. Work on the retaining wall is expected to last until the beginning of April 2026 .
Current status of construction work
- The bridge structure for carrying a farm track and the new roundabout have already been completed.
- The pedestrian and cycle bridge west of Hahn is also completed.
- Road construction on the approximately 1.8 kilometer long route to begin at the end of 2025.
Completion by 2027
The new bypass is scheduled to open to traffic at the end of 2026. Remaining work, such as the dismantling of the old B 426, the creation of construction site facilities, and the construction of new farm roads, is expected to be completed in May 2027 .
Relief for Hahn
Approximately 15,000 vehicles , including many trucks, pass through the narrow and winding main road through Hahn every day. The bypass is intended to divert up to 90 percent of this traffic away from the town. A three-lane expansion of about 1.1 kilometers towards Darmstadt is designed to handle the high volume of truck traffic.
The total cost of the project amounts to approximately 19 million euros , borne by the federal government.
Further information: Hessen Mobil
(RED/HM)
