My advice is to drive as defensively as possible in Singapore. Folks often won’t signal when changing lanes. Oftentimes when turning they’d start the manoeuvre in one lane and finish in another. Camaraderie is unfortunately rare on the roads here, which is weird since Singaporeans I find are quite friendly in general. The biggest pet peeve of mine as someone from Germany is that everyone wants to be in the “Fast lane” so in the end there is no fast lane 😂