Class A taxis, also called private hire taxis, will be able to use bus lanes where certain taxis are being permitted as part of an “experimental scheme.”
The Department for Infrastructure says the extensive trial is needed.
It said a 12-week experiment allowing taxis into bus lanes last year proved inconclusive.
“Taking account of evidence that at least a year is needed to have full confidence in the evidence produced, the department has initiated work to undertake a more extensive trial lasting 12 months which will extend to all bus lanes where certain taxis are currently permitted”, a spokesman said.
The department plans to introduce the year long scheme before the Belfast Rapid Transit System launches in September.