Glen Campbell was in his Victory Pl kitchen just before 10am on Sunday morning when he heard a bang and thought "not again".
He went outside to find a huge truck and trailer unit up on his lawn and just 3m from his bedroom which had caught the telephone landline to his house.
Two truck and trailer units traveling north through Whanganui were directed by GPS to the Dublin St Bridge - which has height restrictions - instead of the Cobham Bridge which is part of State Highway 3.
"They were following each other and the GPS took them to Dublin St Bridge," Fire and Emergency NZ station officer Jes Sorensen said.
"They couldn't cross that so they thought they would go up and find another one."