Instead of turning left into Boundary Rd from Yio Chu Kang Link
in the direction of Shenton Way / Marina Center, it will go
straight down to Serangoon Central, turn left at Upper Serangoon Rd
and then right to Upper Paya Lebar Rd.
In the direction of Yio Chu Kang, it will turn left from Upper Paya
Lebar Rd instead of going straight to Boundary Rd. It will go down
Upper Serangoon Rd and turn right into Serangoon Central, and goes
on straight to Yio Chu Kang Link.
Understand?
