Their blockade cut the main transportation route between the South and other regions of Thailand for more than an hour.
The protesters, came from various provinces including Kanchanaburi, Uthai Thani, and Rayong, also tried to block alternative routes.
The farmers dispersed only after Prachuap Khiri Khan Governor Veera Sriwattanatrakoon informed them that the National Pineapple Development Policy Committee had already approved Bt800million to ease their plight.
Veera said the money would be used to buy 200,000 tonnes of pineapple at Bt4 per kilo.
The Nation