A taxi passenger was injured after a collision occurred between two vehicles. The collision occurred due to the driver of the passenger's taxi collapsing at the controls during a medical episode. The passenger (plaintiff) has argued that the collision could have been avoided if the taxi had been fitted with an 'emergency switch', which stops the taxi in case of an emergency involving the driver. The device had been rejected by the taxi company because it was felt that it could cause drivers to become tired, irritated and inefficient. There was no evidence of any similar device in use on taxis anywhere.

Will the plaintiff succeed in his claim? Explain your reasoning.