Despite a quadrupling of traffic volumes, the original roadway north of the Los Angeles River largely remains as it was when it opened in 1940. Trucks and buses were banned in 1943, though the bus restriction has since been dropped; this has kept the freeway in good condition and relatively safe, despite its outdated design. This design, state-of-the-art when built, includes tight "right-in/right-out" access with a recommended exit speed of and stop signs on the entrance ramps; there are no acceleration or deceleration lanes. While the curves are banked for higher speeds, they were designed at half the modern standard. Except for the Golden State Freeway (I-5) interchange near the river, completed in 1962, the few structural changes to the freeway north of the river include the closure of the original southbound exit to Fair Oaks Avenue after its location on a curve proved dangerous and the replacement of shrubs in the median with a steel and now concrete guard rail. Los Angeles paid for reconstruction of the interchange at Hill Street, south of Elysian Park, in the early 1960s to serve the new Dodger Stadium.