What is arroyo seco freeway?

The first freeway built in the united states
This approximately 8.1 mi elevated span eventually became part of the pasadena freeway connecting Los Angeles to pasadena.g

If we go north on the 710 we will drive over the original span of the arroyo seco freeway on our way to Pasadena and Colorado Blvd

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arroyo seco freeway - video