Putting aside the fact that this was found on an old Tesla with autopilot 1.0, this is not even a technically hard problem to solve. The current version of auto

Putting aside the fact that this was found on an old Tesla with autopilot 1.0, this is not even a technically hard problem to solve. The current version of autopilot uses a database and gps to determine the speed limit. In the future if Tesla wants to return to a vision based speed limit system they can sanity check the vision readings against their database and throw out results like 85mph.