[amelius]

They are running that beta program on public streets, where everybody's safety is involved.

An NDA is not appropriate as an argument here.

[rattray]

The driver surely has access to nonpublic information, even if some of what they do is publicly observable.

Not having an NDA would be inappropriate for any beta tester of a proprietary product, regardless of the location in which their testing primarily occurs.

For context, NDA's are extremely common - in my experience, you can scarcely have a coffee chat with a tech employee at their office without signing one.