I decided to ride the bike across the Causeway from Singapore to Malaysia. It wasn't clear from the signs which lane I was supposed to take (they had one for buses, one for motorcycles which went on the expressway, and one for cars), so I decided to go through the building with the pedestrians. After navigating lots of stairs and a vertical turnstile, I got pulled aside by the authorities. Apparently I was not allowed to go that way, and was supposed to have gone with the motorcycles. They debated my situation for a while, as I waited nervously. Finally, they allowed me through, and escorted me back out of the building to the motorcycle lane. I didn't spend much time in Malaysia, and also had a bit of trouble getting back into Singapore.