Waymo robotaxis have become a common sight on Los Angeles surface streets. Now those driverless vehicles are heading to the city's network of freeways.

The great nightly Waymo honk-a-thon — in which the company's robotaxis erupted into a chorus of honking at night's end in a San Francisco parking lot— was resolved, then not. The backstory: Software engineer Sophia Tung set up a livestream of the parking lot that captured the robotaxis streaming in to park — and honk — for up to an hour around 4 a.