From Seattle to Washington, interstate freeways in urban areas have become enormously controversial because of their expense and their impacts on environment and neighborhoods.

Here is a list of some of the more controversial unresolved freeway projects around the country:

Interstate 10, the Papago Freeway, 6.6 miles at $425 million through Phoenix. This freeway is planned to cut through an archeo logically significant area. It was approved by Transportation Secretary Brock Adams on Oct. 2, after completion of an environmental impact statement. Adams attached several conditions to reduce environmental impact. Another lawsuit is considered possible by U.S. observers.

Interstate 494, the Chicato Crosstown. 13.6 miles at $1.1 billion. One leg of this freeway already has been dropped under a variety of pressures. The remaining leg is in preliminary environmental and design study that will include plans for exclusive bus lanes.

Interstate 105, the Century Freeway, 17.2 miles at $611 million, in Los Angeles. Adams approved construction of this controversial segment in the mother lode of urban freeways on Oct. 17.He took the action as part of approving a new environmental impact statement. More litigation is threatened on a controversy that goes back at least 12 years.

Interstate 90, connecting Seattle and Bellevue, Wash., across Lake Washington and Mercer Island, 6.9 miles at $549 million. Adams approved this freeway in his old congressional district on Sept. 20, and included requirements for exclusive bus lanes and protection of historic areas and parkland. Local foes and a detailed mayor's report claim that the cost will be much more and that the transportation gains could be equaled with less new construction. Another lawsuit is threatened.

Interstate, 40, 4.1 miles through Overton Park in Memphis, at $40 million. Adams became the third secretary of transportation to disapprove of this controversial segment through a mid-city park a year ago, but the idea will not go away. An attempt was made to override Adams in the last Congress.