Students at Fairfield Patrician Brothers are risking their lives every time they try to cross The Horsley Drive, says principal John Killeen.
Mr Killeen is tired of waiting for flashing lights and is supporting calls by the NRMA for the RTA to update its signage in 40kmh school zones.
NRMA director Gary Punch says the RTA should spend an additional $10 the cost of using fluorescent yellow-green for school zone signs as opposed to the standard yellow to improve visibility.
Mr Punch said school zone signs are the same colour as bus stop signs and should be made bolder, giving drivers more time to slow down.
''There are over 3100 schools in NSW and only 5 per cent have flashing lights,'' Mr Punch said.
''The NSW Government is installing flashing lights at 100 new school zone sites each year for the next four years.
''The use of fluorescent green signage should be compulsory during these upgrades.''
Mr Killeen said the location of the school signs are also ''revenue raisers'' given drivers don't get enough time to see them as they turn the corner before slowing down.
An RTA spokesman said the fluorescent yellow/green had been designated for use on pedestrian-related signs.
''The RTA has not received any formal representation by the NRMA regarding the use of fluorescent yellow/green in school speed zone signs and the RTA does not have evidence to suggest the use of fluorescent yellow/green would increase visibility.''