Traps
There will be a trap that the producers would not allow in previous Saw films that they described as "too violent", "too disgusting", and "just wrong". Melton called it the "Garage Trap" which will involve a car and a chain reaction.[23] Producer Oren Koules said that there are eleven traps in the film, the most ever in the franchise
From Wikipedia.
Now, in the trailer we can see Chester in a car screaming, so I assume this is the trap he had... uh... I guess I'll watch the movie...