Three truck drivers' windscreens were shattered as rocks were thrown at them in the space of a few hours on Auckland's Southern Motorway.
The incidents, a haunting reminder of the Chris Currie tragedy in August last year, have police worried that soon another innocent person could be killed on the motorway.
Two trucks were hit within 10 minutes of each other on Thursday night near Takanini.
Express Couriers truck driver Phil Loye, 34, was heading north and had just gone past Takanini when he heard an "almighty smash" just after 9.30pm. His windscreen was shattered probably by a fist-sized rock.
"I was shaking for a good 20 minutes afterwards because it was one hell of a bang," he said.
"My biggest concern was if ... it had hit me I've got a 30-tonne truck that I have got to try and stop from killing someone."
Another Express Couriers truck was hit twice on the same stretch of road 10 minutes later.
A search by police, including a dog and handler, drew a blank.
A third truck from the same company was hit and damaged some three hours later.
The same night a bottle was smashed on a car, police said.
Express Couriers' northern region linehaul manager Dave Clarke said the most worrying thing was that the culprits hadn't learned how dangerous their actions could be, despite a teenager being jailed last month for four years after he killed Taupo man Chris Currie by throwing a slab of concrete from a motorway overbridge.
Mr Clarke said the company had had reports from drivers of "close calls" from as far north as Albany, out West and as far south as Huntly.
Sergeant Gareth Toogood, who attended two of the incidents, said it was likely the culprits lived locally and urged anyone with information to contact the police.
Rocks shatter truckies' windscreens
AdvertisementAdvertise with NZME.