The initial rollout of Autosteer for AP2 was apparently speed-limited to below 45mph: http://www.theverge.com/2017/1/21/14347698/tesla-autopilot-hardware-two-au

The initial rollout of Autosteer for AP2 was apparently speed-limited to below 45mph: http://www.theverge.com/2017/1/21/14347698/tesla-autopilot-hardware-two-autosteer-limited http://www.theverge.com/2017/1/21/14347698/tesla-autopilot-h... So this may well be the only place where it could be safely tested.