"A question was raised late last year from another council about whether mobility scooters could be transported safely," Hindrup said.
"We checked with NZTA then, and again early in the new year, to make sure that this practice was supported. NZTA confirmed the use of the hoist ramp must be done so with the person hoisted, harnessed safely in their device. We passed this communication on to our operators to ensure they were compliant.
"At that time, we had no ruling from NZTA that mobility scooters couldn't be hoisted."
However, in October NZTA was asked whether scooters could be hoisted at all and the agency said they could not.
"As a result we have had to make a change to Total Mobility, and have therefore informed our operators of this as no subsidy will be honoured for mobility scooters," Hindrup said.
"We understand that this will have a financial impact on some users, which we empathise with, however we are obliged to follow NZTA's policy."
NZTA says under traffic law, a mobility scooter is considered a vehicle.
"Under the Total Mobility Scheme, the hoist fee applies only to wheelchairs," a spokeswoman said.
"When the hoist fee was introduced, and then later amended, mobility scooters were not and have never been included as part of the fee."
Age Concern Wanganui and Sommerville Disability Support Services, which carry out assessments in Whanganui for the Total Mobility Scheme, were not aware of concerns about the change to the subsidy for mobility scooter users.