This paper examines the policy processes behind Singapore's car quotas. The policy, when filtered through the market mechanism, had a number of unintended consequences. The public's unhappiness with certain features and [`]loopholes' of the system resulted in many changes to the rules. The effects of recent measures to curb speculation on quota premiums are evaluated. Problems with Singapore's Weekend Car Scheme are also discussed. The lesson for transport policy makers elsewhere is that in attempting to deal with the road congestion problem through car ownership policies, an asset market for vehicles should be taken into account.