If you live in Johor Bahru and work in Singapore (or have some other need to commute frequently, student etc.) you would fill up your passport quickly if you got stamps in your passport for each entry and exit.
The Malaysia Automated Clearance System (MACS) uses a sticker (with embedded with a RFID chip) that is attached to the passport and scanned upon entry and departure from Malaysia. So this removes the Malaysian stamps.
MACS has been developed to cater to non-Malaysian investors, business persons and professionals. A Malaysian sponsor company is required. Working for a business in Iskandar that also required you to work in Singapore would likely qualify. This requirement is stated in some places but seems to be ignored often especially for those with a Singapore passport (which makes sense, say you are just someone who lives in Singapore and has a weekend home in JB shouldn’t you be able to use MACS?).
You can apply and receive your MACS sticker at the main Johor Bahru CIQ (ask when you are there I can’t find a direct link on their web site).
Singapore has the Enhanced Immigration Automated Clearance System (eIACS) for Singapore citizens, permanent residents and Long Term Pass holders and Work pass holders. See the link for various conditions. It might only be available for those with Malaysian, USA, UK, Chinese or Australian passports (I am not sure on this part).
Please add your comments on your experience or suggestions related to commuting between Singapore and Johor Bahru.
Related: Timeline for Extending Singapore’s MRT to Johor Bahru Slips Into 2020, or Beyond – Taking the Bus from Johor Bahru to Singapore – Online Resources for Living in Johor Bahru – Singapore and Iskandar Malaysia