Cruise control does a fine job of matching my speed to that of a slower car ahead as I catch up to him at the preset number of car lengths away; however, I really worry about approaching a road full of stopped cars at 65 mph. When this happened the other day I took over when I approached far to close at 65 and Cruise Control had not begun to slow. If Cruise waited until the preset car lengths to begin speed matching, stopping short of a collision would have been impossible. Do the cruise sensors read speed of the forward vehicle as well as distance away? They need to.