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A point of clarification; it’***** or miss if you only leave the following distance at the default.  You adjust the ACC distance to account for the unpredictability of traffic. The problem is that users, including me, often set the cruise and expect the truck to do the traffic analysis for them and the truck isn’t programmed to make those kinds of decisions. 


I find that ACC in heavy but fast traffic calls for a shorter following distance, to avoid dropping anchor when some selfish turtle decides that 2 car lengths is plenty of room for them to move their mommy van over left, and gradually increase speed, while I’m approaching at full speed.  If you let this happen, it makes ACC frustrating.  Once the traffic abates, you can increase the following distance for a less frenetic driving experience.  There is such a thing as too much traffic for cruise control, even with ACC. 


If you’re letting ACC slow you down before executing the lane change to pass, you’re doing it wrong.  Know your following distance and approach speed differential.  lane change left when you’re approaching a slower moving vehicle in your lane, if someone is outpacing you from behind, the pedal on the right will correct for that condition, allow you to pass the vehicle and get back right so as to not impede traffic.


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