Drivers using the eastern side of the Fairfax County Parkway will have to wait a little longer to get the full benefit of the new interchange at Boudinot Drive near Interstate 95.

The Virginia Department of Transportation does plan to partly open access this afternoon, so that cars from Boudinot Drive and from Fullerton Road in Newington will be able to reach the parkway’s northbound lanes.

But the ramp from the southbound parkway to Boudinot Drive and I-95 will not open for several more weeks. Project managers discovered that they need to stabilize a retaining wall before opening that section of the new ramp, VDOT spokesman Mike Salmon said today.

This interchange is known as Phase IV of the Fairfax County Parkway project and is being built with money from the federal stimulus program.