Originally, the connection of the Long Beach (710) Freeway to the Foothill (210) Freeway was considered a vital connection to reduce traffic in downtown Los Angeles. Interestingly, it still is a vital connection.
As the population grew north of South Pasadena, the need to travel south to work intensified. Fremont Avenue, a main north-south street that goes through South Pasadena, and the Arroyo Seco (110) Parkway are the most viable means for traveling south. In the morning and afternoon, both routes resemble parking lots. If one travels on the 110 to connect to the 710, one must travel to the Golden State (I-5) Freeway, then east on the San Bernardino ( I-10) Freeway, or continue south on the I-5 to the 710.
As a volunteer instructor at the Senior Citizen Center in South Pasadena, I’ve traveled many times up and down Fremont for the last 18 years. Original travel time was 15 to 20 minutes from La Crescenta. Now it takes 30 to 45 minutes.