Disability and business groups have expressed support. Staff for the state commission have recommended approving Cruise, saying its proposal reasonably protects passenger safety.

Citing safety concerns, San Francisco fire, police and transit officials want state regulators to impose restrictions before allowing Cruise’s autonomous vehicles (AV) into the ride-hailing business. They recommend requiring further approval to add more cars and a new working group of state and local officials.

“Deployment of driverless AVs on a much larger scale would increase the likelihood that unusual AV behavior could lead to serious injury or death,” city officials wrote to the California Public Utilities Commission, which is scheduled to weigh Cruise’s permit application on Thursday.

Human error or behaviour such as a road rules violation that diverges from the probable behaviour patterns is a factor in a disproportionate number of collisions

The local officials say a confused Cruise AV briefly blocked a San Francisco fire engine in April that was en route to a three-alarm fire, and days earlier a driverless Cruise car stopped by police appeared to drive away before the officer was done. Cruise said its cars made safe decisions.

While rival Alphabet Inc’s Waymo has charged for rides in suburban Phoenix since 2018, Cruise’s proposed deployment in its hometown of San Francisco, a more densely populated, hilly and unpredictable area, is considered by tech experts the greater challenge.

Waymo has given employees driverless rides in San Francisco since March, and Cruise has offered free late-night test rides to the public since February. Cruise wants to begin by charging during the same period, in a geographic area that avoids downtown.

But there also is a longstanding issue that self-driving cars cannot always correctly predict how humans will react to changing events, including the actions of the car. Cruise has even given the issue a name, the “couples problem,” a former employee said.

Accidents and Near Misses

A decade since California first allowed public testing of self-driving vehicles, smooth rides that follow traffic rules are the norm but surprises persist.

In a public presentation last year, Cruise senior director Brandon Basso described “kinematic uncertainty,” a challenge faced by self-driving cars in predicting actions of humans on the road and deciding, for instance, when to yield.

Cruise said its vehicles understand complex social dynamics and hedge against uncertainty by taking safe actions.

Even the San Francisco officials challenging the permit said that despite “the conspicuous exceptions, the driverless Cruise AV appears to generally operate as a cautious and compliant defensive driver.”

Though self-driving cars can adapt to nearby rule-breakers, “human error or behaviour such as a road rules violation that diverges from the probable behaviour patterns is a factor in a disproportionate number of collisions,” Waymo told Reuters in a statement.

Cruise does not reveal what three former employees say are two key safety statistics internally: how often its cars encounter novel situations or experience what it calls “safety-critical incidents,” a combination of accidents and near-misses.

Public records seen by Reuters show Cruise with its computers in control suffered 34 accidents involving bodily harm or over $1,000 in damage across nearly 3 million miles of driving during a four-year span ended May 2021.

The documents, which Cruise unredacted in February in response to a request by Reuters, show its attempts to avoid repeat collisions.

For 28 of the cases, Cruise pursued technological fixes, which often were related to improving predictions of what humans will do. It also has relaxed some rules: including a response to a 2019 accident that allows the car to “adjust strict adherence to all marked lanes,” so that it could move around parked trucks or slow cyclists.

Waymo in January sought a court order to preserve the confidentiality of its comparable data, calling it trade secrets. The state did not oppose the request, and Waymo’s records remain redacted.

Some accidents have led to lawsuits. A bicycle courier and a scooter rider have sued Cruise, and Waymo settled over a 2016 car accident.

Cruise said the car was not self driving during the scooter incident and is fighting the case.

Bicyclist Christopher McCleary, who last month settled his lawsuit, said he has suffered ongoing injuries from crashing into a Cruise car that he said came to an unexpected halt in San Francisco in 2018, and he questions the experimentation of driverless cars in public.

“Unfortunately,” he said by email, “I feel like Cruise ‘learned’ from hitting me and this is actually a sacrifice I had to make to allow Cruise to become ‘better’ at predicting situations.”

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