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The faster you go, the harder you'll hit

Even where it is not identified as the causal factor, speed invariably plays a critical role in the severity of a crash (Kloden et al., 1997, 2001 & Nilsson, 2004).  In fact, the probability of injury and the severity of those injuries increases exponentially (not linearly) with vehicle speed (Liu et al., 2005). For example:

  • travel at 5km/h over the speed limit in a 60km/h zone, you’re twice as likely to have a serious crash

  • travel at 10km/h over in a 60km/h zone, you’re four times as likely to have a serious crash

  • travel at 20km/h over in a 60km/h zone, you’re 32 times as likely to have a serious crash

  • travel 10km/h faster than the average speed of other traffic, you’re twice as likely to have a serious crash (StreetSmarts, 2019).

Small difference, big effect

This means is that seemingly insignificant speeding infractions can result in devastating outcomes, but conversely a small reduction in speed could avoid them.  Data indicates that by decreasing vehicle speeds by 5 km/h on arterial roads with a speed limit of 60 km/h, there would be an 11.9% reduction in all serious crashes. Similarly, reducing vehicle speeds by a further 5 km/h (i.e. by 10 km/hr) would result in a 17.3% reduction in all serious crashes (ATC, 2003).

Image source: Author, Annette Teng

Deterring speeding: Beyond legal sanctions

Research has reported a speed reduction between 3 and 11 kilometres per hour where Vehicle Activated Signs (VAS) and Speed Indicator Devices (SID) are deployed (Sandberg et al., 2006; Cruzado & Donnell, 2009; Pesti & McCoy, 2001; Poulter & McKenna, 2005, Walter & Knowles, 2008). Studies have also demonstrated the increased efficacy of SID over VAS on local roads (Jomaa et al., 2017).

Engineered to perform

With extreme ingress protection rating, high corrosion resistance and reliable, low maintenance service life, we customise our VAS to suit your local environmental conditions, ensuring continuous operation, and communication regardless of the weather.   

Eliminating power and data challenges

By utilising wireless communication technology and solar power, our VAS are autonomous - eliminating the need for mains power and costly ca