The Certificate of Entitlement (COE) is the quota licence for owning a vehicle in the city-state of Singapore. 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 a period of 10 years. When demand is high, the cost of a COE can exceed the value of the car itself. History On 1 May 1990, the then transportation unit of Singapore's Public Works Department (PWD) instituted a quota limit to vehicles called the COE when rising affluence in the city-state catapulted land transport network usage and previous measure to curb vehicle ownership by simply increasing road taxes was ineffective in controlling vehicle population growth. The premise was that the small city-state had limited land resources, ie. limited supply of roads and car parks / parking lots, (with scarce land being managed to have a greater emphasis on providing an adequate supply of homes), along with demand for vehicle ownership spiralling out of control, would result in traffic conditions exceeding the criterion of a healthy road network that is sustainable by developments in land transport infrastructure resulting in gridlock. Along with a controversial congestion tax called Electronic Road Pricing, the COE system is one of the key pillars in Singapore's traffic management strategies that aims to provide a sustainable urban quality of life. Transport costs rose in tandem with the raising of the COE in February 2022. System Before buying a new vehicle, potential vehicle owners in Singapore are required by the Land Transport Authority (LTA) to first place a monetary bid for a Certificate of Entitlement (COE). The number of available COEs is governed by a quota system called the Vehicle Quota System (VQS) and is announced by LTA in April of each year with a review in October for possible adjustments for the period of one year starting from May. Approximately one-twelfth of the yearly quota is auctioned off each month in a sealed-bid, uniform price auction system and successful bidders pay the lowest winning bid. Vehicle Quota System (VQS) The number of COEs available to the public is regulated by the Vehicle Quota System (VQS) that is calculated every 6 months based on the following conditions: Actual number of vehicles taken off the roads (i.e. number of vehicles de-registered) Allowable growth in vehicle population