That's what I've figured. I'm not upset there isn't one as if it meant that much to me I would have known about it. Though, I do think that with all the safety issues, you'd think the addition of a very inexpensive external temperature sensor would be a high priority on the list. Telling the driver there is likely ice on the road is certainly safer than letting the driver rely on the vehicle's other safety features; as warning a driver might make the driver slow down BEFORE the need for traction control, AWD, Air bags, Crumple zones, etc, etc, etc.. Just my .02