Members of the party voted in favour of a motion calling for the delivery of the A5 and A6 at the annual party conference on Saturday.
Regional Development spokesperson John Dallat said the developments have not been distributed equally.
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Mr Dallat said: "Our second city still holds the unique distinction of two names and no motorway but this not simply a Derry problem, a Tyrone or a Fermanagh problem, it is a problem for the entire North. Outside investment hinges on the North having a modern infrastructure. We will all continue to struggle economically if we are not connected.
"The A6 is not only about the traffic that flows through it, it is about boosting business, expanding tourism and addressing decades of inequality. The A5 is essential to providing new and modern roads for providing not only new investment but increased safety."
(CD/MH)
