Many a times I have had to direct tourists who are trying to find bus 138 in order to get to the zoo from Ang Mo Kio MRT.
Here is a picture walkthrough of how to get to the bus terminal of Ang Mo Kio, and take bus 138!
This is what you will see after exiting the mrt. Head STRAIGHT and DO NOT EXIT the mrt.
You'll then see a lot of people going onto the escalator at this EXIT C
If you look carefully... there is a sign here! :D
Take the escalator ....
And walk a short distance till you see this!
Use the escalators on the RIGHT. Which say "Bus interchange (Level 1)"
You'll then see this, and you will have to walk straight for a while.
There will be some shops on your left selling cakes, bubble tea, donuts etc. Feel free to buy some but please remember that you're not allowed to eat on the bus!
At the end of this straight road, you'll notice this sign, and 138 is on it!
So turn right into this smaller corridor
And walk to the end!
TADAH!! Bus 138! There is even a toilet nearby for you to use.
Please note that if you're paying cash, you must pay EXACT as the bus uncle will not give you any change. This is when I strongly recommend getting an ez-link card. If not make sure you have sufficient coins and small notes for both this trip and your return trip!
The journey is said to be 40 minutes long, and the Zoo is the very last stop, so you won't have to worry about missing any stops :D
I hope this walkthrough is useful for you! Hopefully not so many people will mistakenly walk to the wrong bus stop anymore!