Yes, Lexus GS is available in Hill Start Assist. The available Hill Start Assist variants are: 2018 Lexus GS GS 300 F Sport, 2018 Lexus GS GS 300 Luxury, 2018 Lexus GS GS 300 Premium, 2018 Lexus GS GS 300h, 2018 Lexus GS GS 350 F Sport, 2018 Lexus GS GS 350 Luxury.