Going to Malaysia via the Causeway

If you have not crossed the causeway before by bicycle, your first time will be an interesting experience. The first thing to note is that bicycles are welcome to use car lanes on the Singapore side, but this is not the case on the Malaysian side.

Rules regarding immigration cards have changed and changed. At time of publishing, Malaysian immigration cards are needed for all foreigners to cross over, so it is advisable to get a set and fill in well before you reach the Malaysian side. If you stay near Tanjong Pagar, the Malayan railway station is a good place to get the "white cards". (Edit: The railway station has since been transferred to Singaporean hands, so this is no longer applicable. And in fact, white cards no longer seem mandatory)


When crossing from Singapore to Malaysia

At the Singapore side, if you feel that the queue is shorter in the motorbike lanes, just dismount and carry your bike across the low barrier. Some customs officers will require you to take out your helmet.
At the Malaysia side, be aware of the many humps. The road quality is not very good even within the customs complex itself. Check that your immigration card and passport are stamped. Once you have completely cleared customs, turn left. Make an immediate U turn towards the city centre if you are heading towards Kota Tinggi (~40km away), keeping a watchout for the signs. Continue with the road if you are heading west (e.g. to Pontian (~50km away)).

When crossing from Malaysia to Singapore

There are not that many signs indicating "Singapura", so look out for signs pointing towards "Pusat Bandaraya" (City Centre). The City Centre is where the customs complex is. There is only one motorbike lane and the drain covers there are quite wide, so beware of them. It is also easy to miss the customs officers desk if you are crossing over for the first time. Don't leave Malaysia illegally!

Links: http://en.wikipedia.org/wiki/Johor-Singapore_Causeway

NB. It is illegal to cross the Second Link by bicycle. Generally speaking, the Malaysian authorities are OK with crossing their side of the Second Link (Linkedua) but not the Singapore side, as cycling on Singapore expressways is illegal. Only if you are in dire distress (e.g. fallen sick in Malaysia and very near the Second Link) should you do so. A small number of cyclists have done it and received warnings.