Singapore Buses route 991

Service 991 is a trunk service operated by Abellio Bulim from Bukit Batok and looping at Bukit Batok West Avenue 5, serving the newer estates of Bukit Batok West Avenue 6.

The route commenced operations on 8 July 2018. It is the 7th bus service to be introduced under the Bus Contracting Model (BCM). In Q4 2018, the route will be extended to Choa Chu Kang and it will incorporate the route of service 308, which will then be withdrawn.

Within Bukit Batok, it serves the new BTO flats: Schools and community facilities include: Between 0015 and 0100hrs daily, the route will operate as service 991A and terminate at Bukit Batok West Avenue 3 (Princess Elizabeth Primary School).
 * Sky Vista @ Bukit Batok
 * West Quarry @ Bukit Batok
 * West Plains @ Bukit Batok
 * West Edge @ Bukit Batok
 * West Rock @ Bukit Batok
 * West Valley @ Bukit Batok
 * West Ridges @ Bukit Batok
 * Club CSC @ Bukit Batok
 * Bukit Batok Polyclinic
 * Bukit Batok Market & Food Centre
 * Bukit Batok Presbyterian Church
 * St Luke's Hospital
 * Princess Elizabeth Primary School
 * Millennia Institute
 * Dulwich College

Future Plans
Service 991 presently follows an interim routing within the Bukit Batok estate. In Q4 2018, the route will be extended to Choa Chu Kang via Bukit Gombak MRT, Bukit Batok West Avenue 5, Choa Chu Kang Avenues 3 and 1, and Keat Hong Link, after which it will mirror the route of feeder service 308 to Choa Chu Kang Interchange via Choa Chu Kang Drive.

The route amendment is expected to come in tandem with the opening of Choa Chu Kang Bus Interchange as well as the completion of Bukit Batok West Avenue 5, from West Avenue 2 to West Avenue 9 (currently under construction). When the route is extended, 308 will be withdrawn.

Fleet
The route currently uses MAN NL323F single deckers, most of it is Euro 6.