I find myself using this feature a lot.. as I drive 50 miles to work and then 50 miles back to home everyday.. The most useful time to use it... surprisingly... is in the fog. I was scared to test it in the fog.. but it does work. Set it for the max distance between cars and stay in one lane (preferably the fast lane) And of course.. don't speed! I always set my cruise control @ speed limit in fog (low traffic), most people I've seen driving in the fog are going ~5-10mph less than that, so make sure people driving next to you know you're there so they don't merge into your lane (don't go so fast that they don't even see you). Has anybody else used this feature in the fog?