Well, Svc 169 goes past Khatib and Nee Soon Camps along
Sembawang Road from Yishun MRT towards Ang Mo Kio.
As for Svc 77, it is duplicated by 174 from Bt Batok Ctr to the
junction of East Ave 3 and 6; and the Jln Jurong Kecil/Toh Tuck
Road intersection to the corner of Dunearn Rd and Sixth Ave. The
former covers Toh Tuck Rd, but the latter runs parallel with 61,
66, 157 along Bt Batok East Ave 3 and 6. Svc 985, meanwhile,
provides for residents of Bt Batok East Ave 2. Svc 77 is then
practically duplicated by Svc 106 until Suntec City.
I submitted a three-pronged plan to TIBS for Svcs 75, 77 and 970
but they haven't replied. This plan helps reduce duplication along
the Holland and Orchard corridors. Refer to my posting on 'Fantasy
Bus Routes' concerning this suggestion.