This weekend while traveling on I95N I got into a wreck with automatic cruise control on. I had been in stop and go traffic for about 20 minutes and was following behind a Gatormade hauling trailer for well over a mile with no issues. Suddenly, from a dead stop, the truck attempted to accelerate to its preset speed of 50 mph. I was only one car length away from the trailer and wasn't covering the break. By the time I got my foot on the break, I slammed in the back of the trailer. At no point did the emergency brake warning or any alerts pop up.