The Texas Transportation Institute has released the 2004 Urban Mobility Study that measures a range of congestion, travel time and traffic indicators in urban areas across the country. Not surprisingly, congestion is increasing everywhere. This year they have started measuring how mass transportation reduces congestion in various urban areas (Of the 85 very-large to small urban areas studied, removing public transit would cause an average increase of 29% in the "base travel delay"). An argument against adding singular mass transit lines in various places is that they will do little to reduce congestion, but this report shows that mass transit in most places has a significant overall effect in reducing congestion.