Police have stepped up patrols around a motorway overpass in South Auckland after numerous taxi drivers have been targeted by rock throwers.
But concerned taxi drivers say not enough is being done and fear someone could be killed.
Two taxi drivers - Balkar Singh and Avtar Singh - have spoken out during the last six weeks about having rocks thrown at their cars while driving under the Bader Dr pedestrian overbridge that crosses State Highway 20A.
Now, two more taxi drivers have described similar incidents and echoed calls from the owner of an Auckland taxi company for the NZ Transport Agency (NZTA) to put up barriers to prevent people throwing objects off the bridge.
Sunil Kumar, who works for Auckland Taxi Service, told the Herald a rock narrowly missed his car when he drove under the Bader Dr bridge on October 2.
On October 30, his colleague Manprit Singh's windscreen was cracked by a rock while he was travelling in the same section of road towards the airport.
He said he saw two boys standing on the bridge before the rock hit his car.
The Herald understands other taxi drivers have also had rocks hurled at their cars while driving under the same bridge, but are too scared to speak publicly.
Police were unable to provide specific figures on how many motorists had rocks thrown at them near the Bader Dr overbridge since September, but said they were aware of "at least two" incidents.
Kumar, Avtar Singh and Manprit Singh all say they reported the incidents to police, but never heard back about whether police were investigating.
On October 2, police issued a warning to motorists about a recent trend of people throwing objects from bridges above Auckland motorways, urging them to be vigilant.
A police spokesman told the Herald police took rock throwing seriously and had increased patrols near Bader Dr to try to prevent more incidents occurring.
Typically youth were involved in rock throwing and officers had warned young people who were near the bridge about the dangers of the activity, he said.
"It is only fortunate that no one was seriously injured as this activity is dangerous and extremely reckless. We urge anyone who sees this activity taking place to call 111 as soon as possible."
But, Kumar and Manprit Singh say more police patrols alone won't prevent people throwing rocks and want authorities to step up security on the bridge.
"I don't think they've done enough. Because we are passing every day and someone might be seriously hurt and there might be a serious accident. They can put something on the bridge, mesh or something like that," said Kumar.
Manprit Singh agreed putting mesh on the bridge would help, but feared it would a tragedy would occur first.
"It's only after someone dies or something that they will do it, but that's too late," he said.
A director for Auckland Taxi Service also pushed for barriers to be put up.
"Police have to take some action. I think the best thing is [the police and the Council] could easily put mesh on the bridge. I don't know why they're waiting for something serious to happen," he told the Herald on Sunday last week.
Auckland Co-op driver Balkar Singh was left nursing an injured right shoulder after a rock flew through his windscreen on October 5.
In 2005, Taupo man Chris Currie was killed after 14-year-old Ngatai Reweti dropped an 8kg concrete slab onto Auckland's Southern Motorway from Princess St overbridge in Otahuhu.
Steve Mutton, transport system manager at NZTA, said the agency was working with Auckland Transport to try to stop objects being thrown from overbridges, particularly Bader Dr.
One strategy involved regularly removing large objects near Bader Dr overpass.
NZTA was also considering installing cameras at the overpass or putting up additional mesh fencing and was looking into what immediate solutions would help reduced the risk of rock throwing, he said in statement.
Ten out of 14 overbridges across Auckland's motorway network currently have various types of screens installed.
The agency used "a number of risk criteria" to decide which overbridges needed screens, Mutton said.