- The Johor–Singapore Causeway (Google Maps), which can be crossed by foot at any time in the day/night.
- The Malaysia–Singapore Second Link (Google Maps).
I am confused whether one is allowed to walk across the border between Singapore and Malaysia via the Malaysia–Singapore Second Link.
Wikipedia says it is not allowed:
Unlike its shorter counterparts in Woodlands, as Tuas Checkpoint is designated as a vehicular checkpoint only, travellers are not allowed to walk along the lengthy Second Link and enter the checkpoint by foot.
The  refers to https://www.facebook.com/story.php?story_fbid=339796888172738&id=100064272895973 but I don't see any mention of walking being not allowed on that link.
Meanwhile, user182601 pointed to the Malaysia Ministry of International Trade and Industry's Frequently Asked Questions (FAQ) Reopening of Land Borders (Vaccinated Travel) between Malaysia and Singapore (2022-03-25), which does clearly say it is allowed:
Pedestrians are permitted to walk across the Causeway and Tuas Second Link.
But then someone commented they got detained, and another one also asserted it is not allowed:
This confuses me. Is it allowed to walk across the border between Singapore and Malaysia via the Malaysia–Singapore Second Link?