The merged organisation is called SKM Colin Buchanan.
The companies said that their merger "creates a world leading transport planning consultancy with global reach and increased capacity and capability".
Colin Buchanan was founded in 1964 by Professor Sir Colin Buchanan, author of the UK鈥檚 seminal transport plan that first proposed the London orbital motorway that eventually became the M25.
Colin Buchanan chairman Andreas Markides has joined the board of SKM Europe. 鈥淪KM and Colin Buchanan already have experience through collaboration on a number of opportunities and we now look forward to providing that stronger, joint capability to all our clients,鈥� he said.
SKM chief executive Paul Dougas said: 鈥淥ur strategy continues to be driven by the evolving needs of our clients and their operations. Right now, our transport infrastructure clients are facing particular challenges and require trusted partners to bring deep insights and innovative solutions that meet their commercial needs across the entire life cycle of a project.鈥�
Employee-owned SKM, coincidentally also formedin 1964, employs 6,500 people and annual fee income of more than 拢700m.
Colin Buchanan & Partners has 15 employees. Recent work includes providing economics advice to the Crossrail project.
Michael Shirley, SKM鈥檚 general manager for buildings and infrastructure, added: 鈥淭he combination of Colin Buchanan and SKM鈥檚 transport planning practices will double our strategic capability in this space and create an impressive group of transport planning professionals offering great services and insights to public and private sector clients across a range of geographies.鈥�
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