A bus carrying eight passengers has had its front end crunched by an 18-wheel truck on a busy central Auckland street.

A person travelling on the InterCity bus said as they came around the corner of the one-way Nelson St onto Victoria St West, the truck clipped the front of the bus.

"We were in the far right-hand lane on Nelson St turning right, and they were in the second lane. I think [the truck driver] just misjudged the turn and clipped the front of the bus."

Nobody was injured in the collision and both vehicles were driving "very slow", he said.

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"But still, it was not a very nice experience for anybody."

The collision ripped the left mirror clean off, and cracked a side window.

The heavy-duty truck was was carrying four smashed-up cars and two concrete staircases.

The bus had just arrived in the central city before the crash at about 10.45am, after departing Hamilton at 8am.