Question: Which highway that has a junction at Cairo Junction is 1286 miles long?

Context paragraphs:
Landsat program: The Landsat program is the longest-running enterprise for acquisition of satellite imagery of Earth.  On July 23, 1972 the Earth Resources Technology Satellite was launched.  This was eventually renamed to Landsat.  The most recent, Landsat 8, was launched on February 11, 2013.  The instruments on the Landsat satellites have acquired millions of images.  The images, archived in the United States and at Landsat receiving stations around the world, are a unique resource for global change research and applications in agriculture, cartography, geology, forestry, regional planning, surveillance and education, and can be viewed through the U.S. Geological Survey (USGS) 'EarthExplorer' website.  Landsat 7 data has eight spectral bands with spatial resolutions ranging from 15 to 60 meters; the temporal resolution is 16 days.  Landsat images are usually divided into scenes for easy downloading.  Each Landsat scene is about 115 miles long and 115 miles wide (or 100 nautical miles long and 100 nautical miles wide, or 185 kilometers long and 185 kilometers wide).

Radok Lake: Radok Lake is a meltwater lake about 4 miles long and marked by a slender glacier tongue feeding into it from the west, lying 3 miles south-west of Beaver Lake and 15 miles south-east of the Aramis Range, Prince Charles Mountains.  Plotted by Australian National Antarctic Research Expeditions (ANARE) from air photos taken by the RAAF Antarctic Flight in 1956.  Named for Uwe Radok, Reader (head) of Meteorology Dept at the University of Melbourne, who greatly assisted Australian National Antarctic Research Expeditions (ANARE)'s glaciological program.  Radok Lake is the deepest (362 m) known lake on the Antarctic continent and the only known freshwater lake to host a floating ice tongue glacier.  Drained by 3 miles long Pagodroma Gorge in to Beaver Lake.

Cairo Junction, Illinois: Cairo Junction is an unincorporated community in Alexander County, Illinois, United States.  Cairo Junction is located at the junction of U.S. Route 51, Illinois Route 3, and Illinois Route 37 north of Cairo.

Cairo, Oregon: Cairo is an unincorporated community in Malheur County, Oregon, United States.  Its elevation is 2192 ft above sea level.  It is about 4 mi southwest of Ontario and a half mile north of Cairo Junction, where U.S. Route 20 and U.S. Route 26, running concurrently with Oregon Route 201, turn south towards Nyssa.  Route 201 also continues north from Cairo Junction through Cairo and towards Ontario.

U.S. Route 51: U.S. Route 51 is a south-north United States highway that runs for 1286 mi from the western suburbs of New Orleans, Louisiana to within 100 ft of the Wisconsin–Michigan border.  Much of the highway in Illinois and southern Wisconsin runs parallel to or overlaps Interstate 39 (I-39), and much of the route in several states also parallels the Illinois Central Railroad.  The highway's northern terminus is between Hurley, Wisconsin, and Ironwood, Michigan, where it ends with a T interchange at US 2.  Its southern terminus is Laplace, Louisiana, ending at US 61.

Illinois Route 3: Illinois Route 3 (IL 3) is a major north–south arterial state highway in southwestern Illinois.  It has its southern terminus at Cairo Junction (about 4 mi north of Cairo) at the intersection of Interstate 57 (I-57) and U.S. Route 51 (US 51), and its northern terminus in Grafton at IL 100.  This is a distance of 187.44 mi .

U.S. Virgin Islands Highway 40: Highway 40 is a road on St. Thomas, USVI.  Starting at a junction with Highway 42 on the eastern shore of St. Thomas, the road is about seven miles (11 km) long.  Highway 40 serves several small towns in the eastern and central parts of St. Thomas.  After the junction with Highway 42, the road continues west for a few miles, multiplexing with Highway 37 along the way, until it turns southward to meet Highway 33.  Highway 40 then starts its descent into Charlotte Amalie.  It enters the town on Gamle Norsidevei, until it meets Prindsesse Gade, which is one-way westbound.  Traffic is directed onto Prindsesse to Nye Norsidevei, which is one-way southbound, which then meets Dronnigens Gade (Highway 308).  Traffic on Dronnigens Gade wishing to access Highway 40 must turn right on General Gade, left on Prindsesse, and finally right onto Gamle Norsidevei.

Oregon Route 201: Oregon Route 201 is a north–south state highway in eastern Oregon.  It currently runs from the Idaho state line just south of Adrian to Interstate 84 south of Huntington.  Between the state line and Nyssa, it is known as the Succor Creek Highway No. 450 (see Oregon highways and routes), including the Homedale Spur of the same highway.  Between Nyssa and Cairo Junction, it is part of the Central Oregon Highway No. 7 as a concurrency with U.S. Route 20 and U.S. Route 26, and north of Cairo Junction, it is the Olds Ferry-Ontario Highway No. 455.  At the Idaho state line, Oregon Route 201 becomes State Highway 19.

Tennessee State Route 368: Tennessee State Route 368 is a Tennessee designated state route in Grand Junction, Tennessee.  It is approximately 1.7 miles long.  It begins as a fork in the road from Tennessee State Route 18 and travels nearly due south, intercepting Old Grand Junction Road and Summit Street.  From this point it runs slightly parallel to the rarely used Mississippi Central Railroad and Tippah Street.  It intercepts Tennessee State Route 57 as a T-junction in downtown Grand Junction, Tennessee and stops there.

Birmingham and Warwick Junction Canal: The Birmingham and Warwick Junction Canal is a short canal connecting the Digbeth Branch of the Birmingham and Fazeley Canal in the centre of Birmingham ( ) to the Warwick and Birmingham Canal near Gravelly Hill Interchange ( ).  It was authorized in 1840 by Act of Parliament to relieve pressure on this connection to the Grand Junction Canal leading to London and opened in 1844.  It is 2.5 miles long and has 6 locks.

Supporting paragraphs: Cairo Junction, Illinois U.S. Route 51
Answer: U.S. Route 51