Lubbock is served by major highways. Interstate 27 (the former Avenue H) links the city to Amarillo and Interstate 40, a transcontinental route. I-27 was completed through the city in 1992 (it originally terminated just north of downtown). Other major highways include US 62 and US 82, which run concurrently (except for 4th Street (82) and 19th Street (62)) through the city east–west as the Marsha Sharp Freeway, 19th Street (62 only), 4th Street/Parkway Drive (82 only) and Idalou Highway. US 84 (Avenue Q/Slaton Highway/Clovis Road) is also another east–west route running NW/SE diagonally. US Highway 87 runs between San Angelo and Amarillo and follows I-27 concurrently. State Highway 114 runs east–west, following US 62/82 on the east before going its own way. Lubbock is circled by Loop 289, which suffers from traffic congestion despite being a potential bypass around the city, which is the reason behind I-27 and Brownfield Highway being built through the city to have freeway traffic flow effectively inside the loop.