Construction of a $120m Martin Luther King Memorial could begin soon following the approval of a revised development plan by National Capital Planning Commission (NCPC), US.

The NCPC oversees the development of the National Mall in Washington, DC where the project will be built.

The development has been designed by San Francisco-based ROMA Design Group and will be built on a four-acre site along the Tidal Basin.

The memorial’s circular form is inspired by three themes – democracy, justice and hope.

Twin portal stones to eb known as the Mountain of Despair will welcome the visitor on entering the site, which will contain excerpts from King’s famous civil rights speech of 1963, inscribed on it.

A 30ft-tall statue of King called Stone of Hope, will also make up part of the design.

Construction is scheduled for completion in 2011.