From its Cadillac-signature styling to its performance capabilities, there's no mistaking the STS as anything but a contemporary Cadillac.Signature items styling include vertically stacked headlamps and light-emitting diode (LED) tail lamps, LED center high-mounted stop light (CHMSL), horizontal "spline lines" and dihedral-shaped hood. With an overall length of 4985 mm, a wheelbase of 2957 mm and front/rear track of 1596/1581 mm the STS is the largest sedan in the GM Sigma-based family, which is also the foundation for Cadillac's entry-luxury CTS sedan, CTS V-series high-performance sedan and SRX luxury performance crossover.This ensures a particularly spacious and stylish interior, with an emphasis on high-quality fit and finish.