10 confused robotaxis can't get a cell signal, form a San Francisco traffic jam

On Friday, the North Beach neighborhood of San Francisco was briefly clogged with traffic after autonomous taxis froze at a busy intersection. The jam consisted of at least 10 driverless Chevy Bolts operated by Cruise, General Motors' self-driving car subsidiary.

"One of them was stopped at the top of the hill for no apparent reason," witness Valerie Jacobson told NBC Bay Area.

The mishap coincided with a music festival taking place in nearby Golden Gate Park. Cruise blamed the festival for interfering with network connections to the cars.

"A large festival posed wireless bandwidth constraints causing delayed connectivity to our vehicles. We are actively investigating and working on solutions to prevent this from happening again. We apologize to those who were impacted," said a statement put out by Cruise on social media.