Road Development Authority chairman Ranjith Premasiri said the survey, being done by transport and logistics experts at the university, is to be completed in three months.
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"The RDA will decide where to build new expressways and the connecting roads in future based on this survey," he told Vimasuma.
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Work on the southern expressway is also being expedited.
A section of the expressway between the town of Godagama and Makumbura in Kottawa is to be commissioned in April 2011 with about 70 percent of work already over, he said.
Another expressway is being built between the capital Colombo and the hill country capital of Kandy.
One section of this expressway up to the town of Ambepussa is to complete by end-2011.
Tenders are also to be called soon for another section of the proposed outer circular highway around Colombo that is meant to help traffic bypass the capital.