The company says taking a freeway compared to city streets can cut down on ride times.
MORE: Waymo cars honk at each other throughout the night, disturbing SF neighbors
Waymo cars honk at each other, disturbing SF neighbors
Waymo says a trip from the Lake Merced neighborhood to Oracle Park could be as much as 50% faster by taking the freeway instead of the streets.
For now - only Waymo employees are able to take the freeway rides.
The company is also testing its driverless cars on freeways in Phoenix.
MORE: Waymo service expanding beyond SF to some San Mateo County cities
This comes after Waymo expanded service beyond San Francisco to parts of the Peninsula.
As of August 6, people can catch a driverless taxi to Daly City, Colma, and Broadmoor.