The Land Transport Department can complete the car registration process for a proper plate within a day, police said.
From January 1, any drivers who fail to register their vehicles within 30 days after taking delivery of a new car will face a fine up to Bt10,000, Krissana said.
According to the law, red licence plates are issued to car companies for temporary use on vehicles for sale or maintenance that are not yet subject to registration and taxes.
Authorities have pledged to continue the stringent implementation of the vehicle registration law until the new law to cancel the use of red license plates goes into effect.