Criticism of crowded Auckland school buses from worried North Shore parents.

Video footage has shown a bus meant to carry about 40, appearing packed with about 100 kids.

Some were standing on seat backs, grabbing a handrail.

One mum, Evelyn Araujo, says just braking could be disastrous.

"Students can stand on the bus, that's normal. What is not normal is having over 60 kids standing on the bus, tat's beyond ridiculous." 

Auckland Transport Operations Manager, Rachel Cara, says it's unacceptable - and they are fixing things right now.

"At the moment, we're in conversations with operators around extra-large buses, if available, and looking to put on some extra services, if possible." 

LISTEN ABOVE

• Watch: Parents shocked over 'extremely dangerous' overcrowded school bus