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Estonia has completed the main reconstruction works on a more than 16-kilometre section of state road 52 between Mustla and Kaubi in Viljandi County. The Transport Administration announced the completion on October 15, describing the project as a substantial renewal of the Viljandi–Rõngu route and an improvement to everyday travel in the surrounding rural communities.
The rebuilt section runs between kilometres 25.1 and 41.4 of the state road. The nearly two-year project replaced the road structure, upgraded traffic arrangements and renewed several pieces of supporting infrastructure. It also included the construction of a new Tarvastu bridge and the full reconstruction of the Suislepa bridge.
A complete renewal rather than a surface repair
The project was designed as a broad infrastructure upgrade, not simply a resurfacing exercise. According to the Transport Administration, the road profile and traffic organisation were brought into line with current requirements. Intersections were improved, and sections between the settlements of Soe and Suislepa were redesigned to make movement clearer and safer.
The works also covered drainage structures, road signs and other traffic-management equipment. In Mustla, additional repair work was carried out within the settlement. The result is intended to provide a more consistent route for residents, buses, freight traffic and other road users travelling between the local centres and the wider Viljandi–Rõngu corridor.
Bridges at the centre of the project
The new Tarvastu bridge replaces the previous structure, while the Suislepa bridge was reconstructed as part of the same contract. The bridge works were important components of the project because they addressed not only the road surface but also the capacity and long-term condition of the route’s structures.
The Transport Administration also worked with the Estonian Environment Agency to restore a hydrometric station at Tarvastu bridge. The station supports the monitoring of water conditions and reconnects the upgraded bridge infrastructure with an existing environmental observation function.
Safety improvements continue after opening
The road has been accepted for use, but a limited amount of follow-up work remains. The Transport Administration said that roadside barriers near the Tarvastu and Suislepa bridges will be extended at the end of November. The need for the additional work was identified during a traffic-safety audit.
This final stage illustrates how major road projects can continue to be refined even after the principal construction work has been completed. Rather than delaying the reopening of the whole route, the remaining barrier work is being handled as a finishing task linked to the safety review.
A long-planned investment in regional connectivity
The project was awarded to AS TREV-2 Grupp under a contract signed in March 2025. The original plan divided construction across two working seasons, reflecting the scale of the route and the need to manage construction conditions over a long road section. The contract covered the road reconstruction, the Tarvastu bridge, the Suislepa bridge and repairs in Mustla.
The total project cost was reported at €8.85 million excluding value-added tax. The investment gives the route a new pavement structure and upgraded junctions while also addressing bridge infrastructure and road-side safety equipment.
For rural Estonia, projects of this kind have significance beyond the condition of the asphalt. Reliable roads connect residents with schools, services, workplaces and public transport. They also support the movement of agricultural goods and local businesses between smaller settlements and regional centres.
The Mustla–Kaubi project therefore represents a practical form of regional development: a long-used route has been renewed in one coordinated programme, with road safety, bridge condition, drainage, traffic management and environmental monitoring considered together.
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