Yes, Volvo S90 is available in Hill Start Assist. The available Hill Start Assist variants are: 2018 Volvo S90 T8 Twin Engine Inscription, 2018 Volvo S90 T8 Twin Engine Inscription Plus, 2020 Volvo S90 T8 Twin Engine Inscription Plus, 2020 Volvo S90 T8 Twin Engine Inscription, 2020 Volvo S90 T5.