The Certificate of Entitlement (COE) are classes of categories as part of a quota license for owning a vehicle in Singapore.[1] The licence is obtained from a successful winning bid in an open bid uniform price auction which grants the legal right of the holder to register, own and use a vehicle in Singapore for an initial period of 10 years. When demand is high, the cost of a COE can exceed the value of the car itself.[2] The COE system was implemented in 1990 to regulate the number of vehicles on the road and control traffic congestion, especially in a land-constrained country such as Singapore.