Parents claim parking rangers photographed about 50 vehicles stopped in the bus zone off Keira Mine Rd.

The loop road is deemed by both parents and school staff to be the safest drop-off point.

One frustrated parent said she was not even aware the area was a bus zone.

"I rarely drop my son off at school, and all the parking signs in the drop-off zone are obscured, either by trees or graffiti or are not facing the oncoming traffic," she said.

A spokeswoman for Wollongong City Council said motorists put children's lives at risk when they stopped in bus zones and that the area was well signposted.

"Drivers who stop in the bus zone also impact on the ability of buses to lawfully unload children," she said.

The angry parent told the Mercury she had spoken with a number of others who had used the drop-off zone for several years without ever seeing a parking ranger or encountering any problems.

"It is revenue-raising because there is certainly no safety issue here," she said.

"This is the safest place for parents to drop their sons off ... the other choices are far more dangerous for students."

Principal David Lear said the college had been unaware of the presence of the parking rangers and said parents and buses had been sharing the space for more than five years without any issues.

"We encourage parents to use that side of the school as the point to drop their sons off because it is not as busy as our Mt Keira Rd entrance," he said.

Mr Lear said he would be asking the council to make a few "simple changes" to the signage in the bus zone to allow parents to use the space.

Stopping in a school bus zone carries a fine of $243 and the loss of two demerit points.