We were driving on the [XXX] on [XXX] with a speed of around 70 miles per hour. We started to see a small amount of white smoke coming from under the hood and at the same time the truck started to slow down by itself unexpectedly and then started to jerk back and forth. No indicators showed up on the dashboard. The speed reduced quickly and hitting the gas pedal did nothing to accelerate our speed. The white smoke started to increase and it became difficult to see. We then saw the temperature gauge go all the way up to hot out of nowhere. There were vehicles all around us and the passengers in the car started to yell to try to get to the shoulder. We had to maneuver very quickly through traffic with the car continuing to jerk at a very slow speed, which was very scary and dangerous. We were finally able to slowly get over to the shoulder. We turned off the truck. When we opened the hood, white smoke was everywhere coming from the engine and the coolant in the plastic receptacle was bubbling. The coolant looked like it was about to explode and the driver got burned trying to remove the cap. There was significant heat coming from the engine. The coolant then drained out of the receptacle. When we tried to start the truck again it would not start. We spend hours trying to get a tow to a shop in NJ miles from where we live in NY. Several days later, the mechanic in NJ took a look at the car and he reported this week that the head gasket is blown and that we need a new engine