I've noticed that my AP1 prompts me for the usual "Hold Steering Wheel" with different spans of time in between each prompt. And I haven't been able to find a solid correlation between variables for it myself. Wondering if anyone here knows how the Model-S decides when to prompt the driver, while AP1 is on? For example, when sitting in slow-moving traffic, often times my car goes 15-20 minutes without prompting me to hold the wheel. However, when driving normally, sometimes I get prompted within 3-5 minutes and sometimes even within 60 seconds, regardless of how fast I am going! I've found no solid correlation to my actual speed or distance being covered (other than the fact that in slow moving traffic it prompts me less). And my speed limit settings are set to 4mph over limit; I rarely ever manually increase the limit with the gas pedal when on AP. I do often up the max speed with the AP-stalk though. This does not automatically induce a prompt, however. So, the times between prompts appear to be sporadic and all over the place for me, as far as I can tell.