Comment by lo_zamoyski

> It’s not a viable defense if you get a ticket for speeding but in practice the speed limit is really the prevailing speed of traffic plus X mph, where X adjusted for the state.

A lot of laws aren't enforced consistently in practice, sure. The implicit point is that while that may be so, it is nonetheless enforceable and nonetheless the law. So while individual people may be comfortable about being flexible in following traffic laws, having that behavior encoded or permitted by software is basically a declaration of broad intent to violate the law made by a company.