By 1977, traffic had reached 172,300 vehicles a day, which had increased by nearly 10 percent over the previous year. It was hoped that the construction of SR 52 would help to reduce the congestion. A revised Mission Gorge Road eastbound exit opened in 1979, merging with traffic from I-15. Traffic reached 212,000 vehicles a day by February 1981, and Caltrans declared I-8 east of I-805 the busiest highway in the region. In 1987, Caltrans determined that I-8 west between College Avenue and Waring Road had the highest ratio of cars to number of lanes worldwide, at 2400 cars per hour. Plans to add another lane to I-8 west from College Avenue to I-15 began in March 1992.
By 1977, traffic had reached 172,300 vehicles a day, which had increased by nearly 10 percent over the previous year. It was hoped that the construction of SR 52 would help to reduce the congestion. A revised Mission Gorge Road eastbound exit opened in 1979, merging with traffic from I-15. Traffic reached 212,000 vehicles a day by February 1981, and Caltrans declared I-8 east of I-805 the busiest highway in the region. In 1987, Caltrans determined that I-8 west between College Avenue and Waring Road had the highest ratio of cars to number of lanes worldwide, at 2400 cars per hour. Plans to add another lane to I-8 west from College Avenue to I-15 began in March 1992