A person suffered minor back injuries after the vehicle they were travelling in crashed on the Lincoln Rd overbridge.

Traffic was backed up for about half an hour after the two-vehicle crash on the bridge, which crosses Auckland's Northwestern motorway, at 7.14am today.

However, police have since cleared the backlog.

Earlier this morning, a person was hospitalised with moderate injuries after a crash at Tuakau about 5.30am.

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Northern fire communications shift manager Jaron Phillips says the vehicle rolled on River Rd, near Lapwood Rd.

The driver was the only person in the car.