I-84 is maintained by the Oregon Department of Transportation (ODOT), who conduct an annual survey of traffic volume that is expressed in terms of average annual daily traffic (AADT), a measure of traffic volume for any average day of the year. The highway is the busiest in Oregon, with a daily average of over 177,000 vehicles in eastern Portland; while the least-traveled section of I-84, south of Baker City, only carries 9,400 vehicles. The highway's route through the Columbia River Gorge is considered one of the most scenic sections of the Interstate Highway System and is visited by 4.5 million tourists annually. Portland area Interstate 84 begins across from downtown Portland at an interchange with I-5 on the east bank of the Willamette River, between the Burnside and Steel bridges and adjacent to the Oregon Convention Center complex. The interchange is also the terminus of the Banfield Freeway, officially the T.H. Banfield Expressway, which carries I-84 and US 30 through eastern Portland along a railroad grade. The freeway travels northeast through Sullivan's Gulch, passing under the twin overpasses of Oregon Route 99E (OR 99E), which also carries the Portland Streetcar's Loop lines that serve the Eastside district of the city. At an interchange near the Lloyd Center and Holladay Park, the Banfield Freeway is joined by MAX Light Rail trains, which stop along stations on the north side of the freeway. I-84 serves several local interchanges, which often lack exits for both directions of the freeway, in the neighborhoods of Kerns, Hollywood, North Tabor, and Madison South while following the meandering gulch. After an interchange with OR 213, the freeway intersects the city's north–south bypass, I-205. The two freeways run parallel to each other for , with I-205 and the MAX Light Rail tracks to the west, the railroad and a multi-use path in the center, and I-84 on the east, along the east side of Rocky Butte. At Fremont Street, I-84 splits from I-205 and the MAX Light Rail tracks to continue east along Sandy Boulevard (US 30 Bypass) through the city's easternmost suburban neighborhoods. The freeway briefly enters northern Gresham and passes through the neighboring cities of Fairview and Wood Village before reaching Troutdale. It passes north of downtown Troutdale and crosses over the Sandy River near Troutdale Airport, entering the Sandy River Delta nature reserve. Columbia Gorge I-84 and US 30 emerge from the park at the