Experienced drivers are fully capable and accustomed to driving on the highway at 120 kilometers per hour. In order to quickly improve the efficiency of road use, the maximum speed limit of a certain highway has been changed from 100 kilometers to 120 kilometers. If the following items are true, what would most challenge the above claims? ['Statistics show that the accident rate significantly increases when the driving speed reaches 120 kilometers, which affects the use efficiency of the expressway.', 'The speed limit of 120 kilometers per hour cannot quickly improve the efficiency of highway use, because high-speed driving has high technical requirements.', 'When the speed reaches 120 kilometers per hour, the fuel consumption of the car will increase significantly. Considering the price of fuel, most drivers still relax the throttle.', 'Although the speed limit has been relaxed to 120 kilometers per hour, on many roads, many drivers are concerned about this speed.']