For much of its distance, that route is now followed by I-15.
It connects Highway 4 to Interstate 15, an important trade route (CANAMEX Corridor) between Alberta, American states along I-15, and Mexico.
Interstate 15, a north–south Interstate Highway in the United States of America
The Las Vegas Monorail, FrontRunner commuter rail system and TRAX light rail in Salt Lake City are mass transit lines loosely parallel to I-15 that are now in operation.
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North of Devore, the highway follows the approximate alignment of historic U.S. Highway 66 along with U.S. Highway 91 and U.S. Highway 395.
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At Sweet Grass, I-15 terminates upon crossing the Canadian border into the province of Alberta; however, I-15 signage is present on Alberta Highway 4 southbound from Lethbridge to the U.S.-Canada border.
With enrollment steadily climbing, the governing board of the district enlisted the assistance of the newly established Arizona School Facilities Board to assist in the construction of a new school across the Interstate 15 freeway, and in 1996, then-Arizona governor Fife Symington arrived at the Littlefield School with a $3 million check to the district.
On February 19, 2000, Matt Nokes, who had just signed a minor league contract with the Cleveland Indians, was forced to land a plane he was piloting on Interstate 15 in northern San Diego County.
"Rockin' Chair Theme" is a brief instrumental leading into the next song, "Old Mojave Highway" about the road itself which crossed the desert (now the pathway of Interstate 15).
Interstate 15 runs through the canyon and crosses the Virgin River several times.
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The Lake Hodges Bridge is a component of Interstate 15 that spans Lake Hodges, just south of Escondido, California.
It is found on limestone desert pavements and in sandy washes, and can be found in large numbers around Death Valley National Park and the Mojave National Preserve south of Interstate 15.
The city of Draper, Utah, a suburb of Salt Lake City, announced in 2011 that it would be building Utah's first "ThrU Turn" at the intersection of 12300 South and State Street, just off Interstate 15 through Salt Lake County.
However, most notoriously, in 1989 it was used by the Utah Department of Transportation (UDOT) in an unprecedented large-scale test, to pave a section of Interstate 15 between 5900 South and 3300 South in Salt Lake City, Utah.
Highway 4 leads out to satellite communities (such as Stirling and Warner) and the Canada-United States border, where it meets Interstate 15, connecting eventually to Salt Lake City, Las Vegas and San Diego.
The world's tallest thermometer is located adjacent to a Bob's Big Boy restaurant and is visible along Interstate 15 in Southern California's Mojave Desert at 72155 Baker Boulevard in Baker.