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or limousine ride for 32 miles, and a corresponding use of National by a Baltimore passenger involves a surface journey of 75 minutes to cover the 49 miles. Dulles is 31 miles by surface from downtown Washington, which is traversed by taxi and limousine in 45 minutes. When Interstate Route 66 is completed into the city, a reduction to 25-35 minutes is anticipated by the limousine operator. In all of these city center-airport combinations, the surface travel is for the most part over high-speed dual highways; and while there is a slowing at peak travel times, the increase in time is not great and is confined to that added by congestion within the immediate city areas. 
As to inter-airport surface movements, only that between National and Dulles is direct and uncomplicated, the time and distance for this combination being the same as that between downtown Washington and Dulles. The routings by commercial surface vehicles between National and Friendship and between Dulles and Friendship are through downtown Washington, and they require a change of vehicle. Such a routing would also be necessary for commercial surface travel between Dulles and Baltimore. 10/ Following is a comparison of the surface and air distances and the surface and proposed helicopter travel times. 
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10/ The routing through Washington city center and a change of vehicles could, of course, be avoided by the use of a private car or a taxi. This would be accomplished by the use in part of the interstate beltway around Washington, particularly with respect to journeys between Dulles and Friendship and Baltimore. The surface distance using the beltway between Dulles and Baltimore is approximately 66 miles and that via Washington city center, 71 miles.