Colorado's State Demographer projects that
Colorado will add one million new residents per decade for the next several decades. A high percentage of these residents will locate in the metropolitan areas along the Front Range. The north-south and east-west highways in the Denver metro area are already congested. The Regional Transportation District's FasTracks program will absorb some of these trips. Other trips will be diverted from I-25 and I-70 to the existing 80-mile beltway. Without the Jefferson Parkway, however, the additional trips will be carried by city streets in Broomfield, Arvada and Golden.