Hi Lin! There are different speed limit depending on the type of roads you are driving on. Unless otherwise stated, the default speed is at 50km/hr.

Do refer to following websites for more details :)

https://www.onemotoring.com.sg/content/onemotoring/home/driving/road_safety_and_vehicle_rules/driving-rules.html#Speed_Limit

https://www.onemotoring.com.sg/content/dam/onemotoring/pdf_2017/Speed%20limits%2014%20March%202018.pdf