''The Chief Executives' Committee (CEC) approved the recommendation that in a Test match where, on the last afternoon, it is clear no result is possible, play can be called off at any time once a minimum of 75 overs have been completed,'' the ICC said in a statement here.
Previous regulations only allowed for stumps to be drawn after 30 minutes of the final hour had elapsed.
The new regulation will apply with immediate effect.
Meanwhile, Percy Sonn was inaugurated as ICC President in succession to Ehsan Mani at the conclusion of the annual conference.
The 56 year-old Sonn, a former President of the United Cricket Board of South Africa, is the sixth person to fill the ICC's senior role following Lord (Colin) Cowdrey of Tonbridge (1989-93), Sir Clyde Walcott (1993-97), Jagmohan Dalmiya (1997-2000), Malcolm Gray (2000-2003) and Ehsan Mani (2003-2006).
His appointment as ICC President follows two years as the organisation's Vice-President, a post to which he was appointed in 2004.
Sonn will hold his new office for a minimum of two years and a maximum of three years.
A new Vice-President to replace him will be elected at next year's annual conference.
The annual conference also adopted the ICC's new Strategic Plan which charts the course of the ICC through to 2010.
''It has been put together following an extensive consultation process between an ICC project team, our Members and stakeholders,'' Mr Sonn said.
''It is the organisation's roadmap for the next five years,'' he added.
The annual conference also approved an application from Myanmar to become an Affiliate Member. This takes the total membership to 97, made up of 10 Full Members, 32 Associates and 55 Affiliates.
The CEC also adopted the ICC Gender Recognition Policy enabling cricketers who have undergone gender reassignment surgery to play women's cricket at international level providing they meet the required criteria.
The adoption of such a policy follows the ICC's integration with the International Women's Cricket Council (IWCC) in 2005 and brings it in line with other international sporting organisations, including the International Olympic Committee and the International Association of Athletics Federations.