Service 991B – SMRT Buses MAN A22 Euro 6 (SG1753S) Service 991B – SMRT Buses MAN A22 Euro 6 (SG1753S) Service 991B – SMRT Buses MAN A22 Euro 6 (SG1753S)
17 May 2024 - 31 October 2025 Bus Service Diversion for Early Closure of Jurong West Avenue 4 for JRL Works