Build temp interchange loh,
just like their usual practice when they upgraded Toa Payoh, Ang
Mo Kio, Clementi, Jurong East, Boon Lay, Bt Panjang, Bedok
suitable space? Maybe Yishun Ave 7 or 6, or further up Yishun
Ave 2, near the Industrial estate there
I remember there a space adjacent to the Yishun Reservoir and
Yishun North NPC there at Yishun Central near Ave 9 there