We’ve nearly reached Peak Crossover SUV, which means great cars like the 2018 Cadillac CTS seem hopelessly off-trend. It’s too bad. With the brilliant CTS, Cadillac puts itself on par with the Mercedes E-Class and Audi A6, whether it’s a base model, or one of Luxury trims, or a CTS VSport. No need for a concealed-carry permit...