Question: Do Interstate 90 in Pennsylvania and U.S. Route 20 intersect or are they parallel?
Context: Calpella is a census-designated place in Mendocino County, California.  It is located on the Russian River 6 mi north of Ukiah, at an elevation of 682 feet (208 m).  It is within the Ukiah Valley where U.S. Route 101 and State Route 20 intersect.  The population was 679 at the 2010 census.  The small town is the site of the Mendocino Redwood Company mill and offices, which controls ten percent of the private land in the county. Route 181 is a 9.43 mi long north–south state highway in Massachusetts starting at an intersection with U.S. Route 20 in Palmer, located in Hampden County.  The route crosses the Mass Pike (Interstate 90), but does not intersect.  The route crosses through the Bondsville section of Palmer, crossing into Hampshire County, where it enters Belchertown.  In Belchertown, Route 181 comes to an end at a junction with the concurrent U.S. Route 202 and Route 21. Interstate 40 (I-40) is a major east-west Interstate Highway running through the south-central portion of the United States generally north of Interstate 10 and Interstate 20 but south of Interstate 70.  The western end is at Interstate 15 in Barstow, California; its eastern end is at a concurrency of U.S. Route 117 and North Carolina Highway 132 in Wilmington, North Carolina.  It is the third longest interstate in the United States, behind Interstate 80 and Interstate 90.  Much of the western part of I-40, from Oklahoma City to Barstow, parallels or overlays the historic U.S. Route 66, east of Oklahoma City the route generally parallels U.S. Route 64 and U.S. Route 70.  I-40 runs through many major cities including Albuquerque, New Mexico; Amarillo, Texas; Oklahoma City, Oklahoma; Little Rock, Arkansas; Memphis, Tennessee; Nashville, Tennessee; Knoxville, Tennessee; and Raleigh, North Carolina. U.S. Route 20 (US 20) is an east–west United States highway that stretches from the Pacific Northwest all the way to New England.  The "0" in its route number indicates that US 20 is a coast-to-coast route.  Spanning 3365 mi , it is the longest road in the United States, and the route roughly parallels that of Interstate 90 (I-90).  There is a discontinuity in the official designation of US 20 through Yellowstone National Park, with unnumbered roads used to traverse the park. U.S. Route 20 is an east-west U.S. Highway in Pennsylvania, which clips the northwestern corner of the state, running entirely in Erie County.  While it is part of the nation's longest road, it features the shortest segment of any two-digit U.S. route in the commonwealth.  Although bypassed by Interstate 90 as the primary through route in the area, heavy traffic has led to nearly the entire highway being upgraded to four lanes in width. Magic Waters is a Rockford Park District waterpark in Cherry Valley, Winnebago County, Illinois.  It is located next to the interchange between Interstate 39/U.S. Route 51 and Interstate 90 near U.S. Route 20. U.S. Route 6N (US 6N) is a 28 mi auxiliary route of U.S. Route 6 located in Erie County, Pennsylvania.  The western terminus is at U.S. Route 20 in West Springfield a half-mile north of Interstate 90 exit 3.  Its eastern terminus is at U.S. Route 6 and U.S. Route 19 west of Mill Village. Pennsylvania Route 832 (PA 832), known locally as Sterrettania Road and Peninsula Drive, is a state highway located in Erie County, Pennsylvania.  Its northern terminus is at the entrance to Presque Isle State Park in Erie.  The southern terminus is at PA 98, two miles (3 km) west of Sterrettania in Fairview Township.  PA 832 has junctions with U.S. Route 20 (US 20), PA 5 and PA 5 Alternate (PA 5 Alt.) .  PA 832 is exit 18 off Interstate 90 (I-90).  PA 832 was designated in 1928 between PA 99 (now PA 5 Alt.)  and Presque Isle.  The route was extended south to US 20 by 1940.  PA 832 was further extended to I-90 by 1959 and PA 98 by 1970. Within the U.S. state of Pennsylvania, Interstate 90 spans 46.297 mi , all within Erie County, from the Ohio border near West Springfield to the New York border near North East.  I-90 is the primary west–east highway in the Erie area, passing south of downtown and interchanging with Interstate 79, which connects downtown Erie to southern Pennsylvania and beyond, and Interstate 86, linking Erie to the Southern Tier of New York.  U.S. Route 20, which interchanges with I-90 near the New York-Pennsylvania border, parallels I-90 across the county. Interstate 90 (I-90) is a part of the Interstate Highway System that runs from Seattle, Washington, to Boston, Massachusetts.  In the U.S. state of New York, I-90 extends 385.88 mi from the Pennsylvania state line at Ripley to the Massachusetts state line at Canaan, and is the second-longest highway in the state after NY 17.  Although most of the route is part of the tolled New York State Thruway, two non-tolled sections exist along I-90 (the first, situated outside of Buffalo, is included in the Thruway system; the second, situated in the Capital District, is not part of the Thruway system and links Albany and its eastern suburbs).  Within New York, I-90 has a complete set of auxiliary Interstates, which means that there are interstates numbered I-190 through I-990 in the state, with no gaps in between.  For most of its length in New York, I-90 runs parallel to the former Erie Canal route, New York State Route 5 (NY 5), U.S. Route 20 (US 20) and the CSX railroad mainline that traverses the state.
Answer: parallels that of Interstate 90 (I-90