 Singapore has done a lot to try to solve its traffic problems. For example, to drive into the downtown business district, motorists need to buy a special pass. They can go into the business district only if they have the pass on their windshield. Another thing Singapore has done is to make it more difficult to buy cars. People have to apply for a certificate before they can buy a car. Not everyone can get a certificate. There's a limited number of them. There's also a high tax on cars, so a new one costs a lot of money. A car can cost three or four times more in Singapore than in the US or Canada. The other thing Singapore has done is build an excellent public transportation system. Their subway system is one of the best in the world, and there's also a very good taxi and bus system.