Police found the drug hidden in several secret compartments after the driver, identified as Surachai Kreethong, 41, failed to produce his driving licence and ID card.
Police said Surachai calmly stopped his pickup at the checkpoint for police to check but he did not carry his driving license and ID card, prompting police to search the pickup.
Police found that the pickup belongs to a 61-year-old woman in Nakhon Si Thammarat. Police will summon her for questioning.
Surachai said he was paid to drive the pickup to deliver the drugs to a recipient in Nakhon Si Thammarat.
He claimed he picked up the drug from Phetchaburi but police noticed that the meth pills carried the same symbol of meth pills normally smuggled through Chiang Rai's border.