Sgjb
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Stay in JB and work in Singapore. Earn S$ and spend in MYR ...sounds like a great idea. I'm sure some people are already doing this. Please share what are the issues/problems doing this.
Which are the areas/development/project to consider?

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if u divide it by 3, it will be very cheap...

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Updated Jan 2017, it is divide by 3.1 nowadays... recently you will need to factor in RM20 RC (Road Charge) if you travel daily in a SG registered car and S$6.4 RRC (Reciprocal Road Charge) if you travel daily in a Malaysian registered car.

Wonder if more and more people will opt for public transport, travel with motorcycle, or move into Singapore?

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Probably public transport will be a better solution..

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To avoid the causeway congestion. The Shuttle Tebrau train or the future HSR would be a good alternative to bus or motorcycle...

The cheapest option would be to walk across the causeway on foot.  However,  there was a case where a motorcyclist hit a pedestrian and he died a few days later unfortunately.