P181/P172 Jalan Batu Kawan/Bukit Tambun

I think now is Malaysia Federal Route 149 (FT149), but OSM display those roads as P181/P172.

If you’ve travelled across the route recently, and seen any changes, then you may go ahead.

Ok, maybe those are old coding.

Penang has taught me a lot, especially with road references.

CC-BY-SA Malaysiana85/Wikimedia Commons

The (adjacent) road references (like the above 3-way intersectional sign sample) might not be correct. Instead, look for a single sign like this:

… which could be erected anywhere across the road!

Do the guys from Penang travel too often to Thailand? In the Thai branch, we have a few discussions on strange reference numbers, e.g.
Can be fun!