:roll: Would be helpful if you would indicate your geographical location... the "Signature" facility in PriusOnline is a super place to provide that information in each of your posts. I would also suggest providing the pertinent info on your Prius... yr model, package, etc.
Do you mean the amber signal that looks like an asterisk (snowflake) on a departing highway? If so, that indicates that the outside temperature is 34º F or less... a notice that ice could make the highway slick. Your location would help indicate whether you live in an area where that temperature is likely.
manual pg 116." the light comes on when the outside temperature is less than 37 degree F"..... why does anyone need a warning light to know the temp out side is less than 37 degrees? isn't the temp already available on the energy monitor? seems like useless information to me or is there some other reason for this indicator light to be alarming my wife? :roll: