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Holey Heck: WSP Research to test perforated traffic signs

In a prime example of 'let's give this a shot,' WSP Research is gearing up to drill numerous holes in temporary traffic signs to assess their resilience in strong winds.

The theory being tested is that wind will pass through the holes – meaning the signs will experience less wind load and be less likely to blow over. Apart from school patrol lollipops, perforated signs aren’t used in New Zealand.

Part of the reason is that drilling small holes in sheet metal has been a long, manual process. But now, thanks to the latest computer numerical machining technology, it can be completed more efficiently and automatically. 

Reducing Risk

A collaboration between WSPs behavioural scientists, wind engineers and structural test team, the project is being funded through Waka Kotahi NZ Transport Agency’s Hoe ki angitū – Innovation Fund.

WSP senior behavioural science researcher Joel Burton says there’s an important health and safety reason behind the testing. In windy conditions, temporary traffic signs often end up on the ground - requiring roadworkers to enter the road corridor to retrieve them.   


Decreasing the time spent on tasks such as picking up fallen signs in traffic is expected to significantly reduce the risk envelope for roadworkers.  

Petone Research Facility

To test the theory, wind tunnel testing will be done at WSP’s Petone research facility.

Legibility and reflectivity testing will also be done to make sure the perforated signs are clear and visible.   
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Comparative Road Sign Testing

"In simple terms, we're going to test how much force it takes to make a road sign tip in a lab. Afterward, we'll use a wind tunnel to figure out the wind speed needed to tip the sign. We'll compare a regular sign with one that has perforations to ensure the perforated sign can handle higher wind speeds, meaning it's less likely to tip over in similar windy conditions," says Joel. 

An iwi supplier is providing the testing materials – including 750 x 750mm diamond-shaped signs, sign stands, and sand-filled anchor bags. 

Results of the testing are expected to be available in early 2024.