As discussed in the case the main defense is about the application of risk doctorine and due deligence in taking all possible actions in order to make safe riding of bumper cars and also having the policy/procedure to avoid head on collisions. It is important to note that the car in which Nalwa was riding was bumped from the front as well from behind that caused the injury to the plaintiff. The defendents had no role even no negligence on their part that may be reasonably and or rationally linked to the accident resulting injury to the pliantiff. As per my understanding of the question related to potential product liability in case of bumper carsneeds to have a proper trade-off between the likely thrill and or recreational or entertaining utility with the likely inherent occurrence of minor and or major injury. Sufficient safeguard measures needed to prevent the frontal and or other collisions that may result in causing injury to the riders and for this the owners and maintenance staff should be having the primary responsibility. The maintenance and rides staff alongwith the owners of the park are responsible for providing safety to the riders of their bumper cars.