Info gotten from sgWiki:
Service 621 - observed evening peak freq - 12
mins - Full AC Route Details: via Lau Pa Sat , Shenton Way u turn
along Palmer Rd, Anson Rd, Robinson Rd, u turn at Lau Pa Sat, nack
along Shenton Way, then ECP, Bedok South Ave 1, Bedok South Road,
Bedok MRT (New Upper Changi Road), Bedok North St 3, Bedok
Reservior Road.
Not really 12 min interval. Very irregular. I noe one of the
drivers well and have joyrided on his bus. Sometimes(at Bedok
South) the interval can be between 4 min(if you are lucky) and 20
min(if got bus jam at ECP)...
