Federal officials have agreed to provide nearly $30 million to build the long-planned Dulles Access extension that will connect the airport road with Interstate Rte. 66 in Falls Church.

The agreement was announced yesterday by U.S. Sen. John W. Warner (R-Va.), who said he had received a written pledge from Transportation Secretary Drew Lewis committing federal highway funds to the project. Construction could begin in the fall and is expected to take three years.

Extension of the Dulles access road has been planned for many years, but delays in the construction of I-66 forced postponement. The 14-mile airport road now ends at the Capital Beltway.

The 3.7 mile, four-lane extension will be designed to cut travel time to and from Dulles International Airport.It will also provide a direct link to the proposed West Falls Church Metro stop, which will be located at Haycock Road and Leesburg Pike (Rte. 7).

The Dulles extension, however, is not seen as a major commuter route. During rush hours, only carpools, buses, emergency vehicles and traffic to and from the airport would be permitted on it. At times other than rush hour, the extension would be open to all traffic except trucks.