Existing fares do not reflect the actual cost of operating a bus service with the diesel price hitting 30 baht per litre today, he said. The ministry refused to raise public transport fares, reasoning it was in the process of studying all transportation costs which would take around two months. The government Wednesday announced it would cap the diesel price at 30 baht per litre to ease the impact resulting from climbing world oil prices. This resulted in the price of diesel in Thailand jumping by 3.82 baht per litre in one day. The operator said it would need to raise fares if the diesel price continues to rise.

Source: Bangkok Post May 23, 2018 22:52 UTC