Mike Webster said he was delivering tyres when he saw a white truck hit a power pole near the intersection of Kenmure Rd and Hawthorn Ave, about 11.30am.
He saw the top of the power pole come down.
He believed the white truck had "spun out" while going around the bend and hit a maroon sedan before colliding with the power pole and speeding off.
Mr Webster gave chase as far as Mataora Rd where he noted the fleeing vehicle’s registration plate number.
He said it felt good to be of assistance and he was "pretty chuffed" with himself.
A nearby resident heard a massive "thump thump" when the crash occurred.
The power went out and then came back on.
He went out to the road where everything was shaking, he said.
His neighbours had made the driver of the maroon sedan a cup of coffee and had him sitting inside their house.
The driver was shaken but without injuries, he said.
A Fire and Emergency New Zealand spokesman said one crew attended, from Roslyn Station.
They made the scene safe and handed over to police and the lines company.
A spokeswoman for Aurora Energy said four houses were left without power until about 4.30pm.
A police spokesman said the road was closed for a short period and inquiries into the circumstances of the crash were ongoing.
Another resident said that the area of Kenmure Rd
where the crash occurred
was an extremely dangerous place.
The road needed a mirror and she had asked for one repeatedly, she said.
Dunedin City Council group manager, transport, Jeanine Benson said that the council no longer installed convex safety mirrors because they could sometimes give a false sense of the distance and speed of an oncoming vehicle.
Upgrades which would improve safety at the intersections of Kenmure Rd, Mailer St and Hawthorn Ave were planned to take place sometime between 2024 and 2027, she said.
