To predict the average speeds of vehicles on the interstates, the DOT plans to use a multiple regression model. They feel that the vehicle speed is determined by a variety of factors including the type of the vehicle (coupe, sedan, hatchback, etc.), vehicle age, engine size, road conditions, weather, driver age, time of the day (morning, afternoon, etc).

To predict the average speeds of vehicles on the interstates, the DOT plans to use a multiple regression model. They feel that the vehicle speed is determined by a variety of factors including the type of the vehicle (coupe, sedan, hatchback, etc.), vehicle age, engine size, road conditions, weather, driver age, time of the day (morning, afternoon, etc).

Which of these are most likely categorical predictors?