Top thread. Thanks to all.
As for Singapore, the road runway I knew when I lived there in the late 90s was on the East Coast Parkway as it approaches Changi airport after passing the Tanah Merah ferry terminal.
Keen eyed observers would have noticed that all the plants making up the central reservation were in portable containers whereas on the rest of the ECP they were in permanent homes. Markings for when the runway was in use were also visible.
I think they may have tested the runway out just once in my three years there, but -- as usual -- stand to be corrected.