Security and guarding is to be withdrawn at the Sprucefield park-and-ride scheme.
It is due to happen in May with the park-and-ride sites at Blacks Road, Dundonald and Cairnshill also affected.
Regional Development minister Danny Kennedy said he had to make the decision due to major cuts to funding.
The DRD minister said his department is facing a cut of £60m in its budget in the financial year 2015/16.
“I have had no other option but to make savings wherever I can find them,” he said.
“Unfortunately this includes suspending the security and guarding arrangements at four park and ride sites.”
The minister told the DRD committee last week that only £13m was available for TransportNI to cover the cost of street lighting, patching materials and salt, external contractors, fleet maintenance and fuel.
The cost of all those services, he added, is normally over £40 million.