- 1 Service 991 SD will perform one (1) down-route trip as Service 991 from Choa Chu Kang Avenue 1 (Bus Stop 44091 - Bef Choa Chu Kang Mkt) towards Choa Chu Kang Interchange before Weekends & Public Holidays AM Peak, departing at 0545 hours.
- 3 Service 991 DDs will perform one (1) down-route trip as Service 991 from Choa Chu Kang Avenue 1 (Bus Stop 44091 - Bef Choa Chu Kang Mkt) towards Choa Chu Kang Interchange before Weekdays AM Peak, departing at 0530 hours, 0540 hours & 0550 hours.
- 3 Service 991 SDs will perform one (1) supplementary trip as Short-Trip 991B during Weekends & Public Holidays PM Off-Peak.
- 4 Service 991 DDs will perform one (1) down-route trip as Service 991 from Bukit Batok West Avenue 3 (Bus Stop 43349 - Opp Princess E Pr Sch) towards Bukit Batok Interchange before Weekdays AM Peak. departing at 0530 hours, 0538 hours, 0546 hours & 0554 hours.
- 4 Service 991 DDs will perform one (1) supplementary trip as Short-Trip 991A during Weekdays PM Off-Peak.
- 4 Service 991 SDs will perform one (1) down-route trip as Service 991 from Bukit Batok West Avenue 3 (Bus Stop 43349 - Opp Princess E Pr Sch) towards Bukit Batok Interchange before Weekends & Public Holidays AM Peak, departing at 0530 hours, 0541 hours, 0553 hours & 0605 hours.
- 4 Service 991 SDs will perform one (1) supplementary trip as Short-Trip 991A during Weekends & Public Holidays PM Off-Peak.
- 3 Service 991 DDs will perform one (1) supplementary trip as Short-Trip 991B during Weekdays PM Off-Peak.
- Several Service 991 DDs will perform supplementary trips as Short-Trip 991C during Weekdays AM Peak & AM Off-Peak.
- Several Service 991 buses will perform crossover trips on Short-Trip 975A during Weekdays PM Peak & PM Off-Peak.
- Several Service 75 & Service 172 SDs will perform on Service 991 on Weekends & Public Holidays.
- All Service 991 buses departing
- Bukit Batok Interchange after 0000 hours will operate as Short-Trip 991A.
- Choa Chu Kang Interchange after 0000 hours will operate as Short-Trip 991B.
- Full SD fleet on Weekends & Public Holidays.
- This service practices jumpbus.
- All Service 991 buses park at Bulim Depot (BUDEP).
- Weekdays: 9 AM-PM / 4 S1 / 2 S2 (15 buses)
- Weekends: 7 AM-PM / 1 TQ (8 buses)
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