Another rule revision meant that the minimum weight limit of applied to both car and driver together. Prior to the first session of the season, all of the drivers were weighed to establish a reference weight to be used on occasions when the two were weighed separately, or if the driver was unavailable to be weighed. As such, a small competitive advantage could be established if the driver attempted to register a weight as heavy as possible, so their actual weight when driving the car would be lower.