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Comol5 joint venture will realize the first part of the RijnlandRoute in South Holland, Netherlands

The Province of South Holland has awarded the contract for building the RijnlandRoute to Comol5. This international joint venture consists of TBI companies Mobilis and Croonwolter&dros (25% each), DIMCO (DEME Infra Marine Contractors) (25%) and VINCI Construction Grands Projets (25%). The value of the contract is 492 million euros.


Comol5 will be responsible for the reconstruction of the Leiden West motorway junction and the construction of the 4 km new road N434, including a 2.2 kilometre-length bored tunnel. Comol5 will also implement 12km of motorway widening and adaptations to the A4 and A44 required for construction of the RijnlandRoute. These will be made under traffic with pertaining interchanges . In addition to construction, which will be completed in about 6 years, the contract comprises maintenance for 15 years. 

The RijnlandRoute is the new road connection from Katwijk, via the A44, to the A4 at Leiden. The RijnlandRoute is being constructed to improve the accessibility and traffic flow in the region, and stimulate economic growth.

The project partners of Comol5 have ample experience with designing and developing large infrastructural projects such as bridges and tunnels, particularly bored tunnels. Projects they were involved in included a.o. construction of the Coentunnel and the Delft railway tunnel in the Netherlands, as well as the duplex tunnel (bored double-deck tunnel) in the A86 near Paris. 

Comol5’s tender turned out to be the most economically advantageous tender (MEAT). This means that not only price but also added value was considered. Criteria that play a role include limiting environmental nuisance, traffic nuisance and risks.

Martin Ockier, General Manager DIMCO: “For a complex infrastructure project such as the RijnlandRoute, DIMCO can rely on extensive technical knowledge and experience. The technique of bored tunnels, our specialism alongside marine civil works, closely relates to dredging technology of the DEME Group, the mother company of DIMCO. Projects in our Benelux home market are important for the further development of our global operations. With Comol5 we can count on strong and experienced partners, and we look forward to a successful cooperation in order to realize the project.”

About DIMCO 
DIMCO is a subsidiary of the Belgian dredging, environmental and marine engineering group DEME, international market leader in complex marine engineering works. DIMCO specialises in marine infrastructure and civil works projects that complement DEME’s activities and was involved in the Netherlands in the Coentunnel, the Delft railway tunnel and the Offshore Terminal in the Port of Rotterdam, among other projects. The DEME Group is profiling itself as a ‘global solutions provider’. DEME has 4,600 employees throughout the world. The DEME group produced sales of 2.35 billion euros in 2015. See

About Mobilis and Croonwolter&dros
Mobilis and Croonwolter&dros are operating companies of TBI. TBI is a group of companies that innovates, arranges and maintains the physical living environment. The companies have high-quality, specialist expertise available in the areas of technology, construction and infrastructure. They complement each other in various disciplines (electrotechnical and mechanical engineering and civil construction) as well as knowledge of the total process. They collaborate on a basis of equivalence, trust and transparency. Their integral approach also ensures that the parties efficiently collaborate financially to obtain the best result. In 2015 the combined sales of the companies were €1,557 million. 

VINCI is a global player in concessions and construction, employing more than 185,000 people in some 100 countries. VINCI designs, finances, builds and operates infrastructure and facilities that help improve daily life and mobility for all. Because VINCI believes in all-round performance, above and beyond economic and financial results, VINCI is committed to operating in an environmentally and socially responsible manner. And because projects are in the public interest, VINCI considers that reaching out to all our stakeholders and engaging in dialogue with them is essential in the conduct of their business activities

Additional information
Vicky Cosemans – Head of Communications – DEME Group
+32 3 250 59 22


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