The growth cap for all passenger cars and motorcycles will be cut from 0.25 per cent a year to zero with effect from February, the Land Transport Authority (LTA) said.
The affluent city-state of 5.6 million people already imposes a quota on the number of vehicles sold and the number on its roads, and has avoided the massive traffic jams that choke other Asian cities.
A Toyota Corolla Altis, a five-door sedan, can cost up to around Sg$111,000 in Singapore, including the price of the certificate, or about four times what it costs in the US.
There were more than 600,000 private cars in Singapore at the end of 2016.
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No timetable was given for the freeze but the number of buses and goods vehicles will be allowed to continue growing.
However it said the government would spend Sg$28 billion over the next five years to expand and upgrade the transport system, including the metro, which has recently faced criticism for a series of breakdowns.
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