- 1 extra DD.
- 1 Service 991 DD 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) crossover trip on Service 61 towards Eunos Interchange during Weekdays AM Peak & AM Off-Peak.
- 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.
- 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 Daily AM Peak.
- Weekdays: Departing at 0530 hours, 0538 hours, 0546 hours & 0554 hours.
- Weekends & Public Holidays: Departing at 0530 hours, 0541 hours, 0553 hours & 0605 hours.
- Several Service 991 DDs will perform terminating trips as Short Trip 991A & Short Trip 991B during Daily PM Off-Peak.
- Several Service 991 buses will
- perform down-route trips on Service 991 from Choa Chu Kang Avenue 3 (Bus Stop 44079 - Opp Blk 464) towards Bukit Batok Interchange before & during Weekdays AM Peak.
- perform supplementary trips as Short Trip 991C before & during Weekdays AM Peak.
- SMB1607D & Several Service 991 DDs will perform crossover trips on Short Trip 975A during Weekdays PM Peak & PM Off-Peak.
- SMB1607D (Service 991) will operate on Service 983 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.
- This service practises jumpbus.
- All Service 991 buses park at Bulim Depot (BUDEP).
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