A group of cars on the freeway or interstate.That are traveling above the speed limit in a close formation, and are basically useing strength in numbers in order to avoid Police persuit ,or Radar detection. The number of Cars needed to form a pack is atleast 3 and can grow or shrink as you cover more distance . The number usually doesn't exceed 10 because the more vehicles that join the pack the better your odds will be but any more than 10 cars and speeding in a formation becomes difficult.
A Wolf pack is a formation of 3 or more Cars speeding on the interstate . A pack uses strength in numbers to avoid Police and Radar.