Case study

Curve Advisory

Identifying risky infrastructure with the Cahill Expressway.

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Roads and infrastructure are always designed with safety in mind but even the best of designers can’t always take into account how the roads will be used. The Cahill Expressway, for example, was noted to be a risk to drivers at times and road designers wanted to see if the design was interacted with appropriately or if it was suitable for road users.


Using Brakepoint showed that cars were experiencing high g-forces even at the appropriate curve advisory speed (35 km/h). There was also evidence of drivers going beyond the advised speed limit and the absolute speed limit (60 km/h). The acceleration/deceleration data indicates that drivers experience difficulty ascending the ramp.


Graphical and empirical data shows violet swerving and heavy g-forces for drivers using the ramp which is a concern when it comes to road safety. With the turn to ascend, vehicles were travelling between roughly 45-70 km/h - well above the posted advisory limit. With such behaviour seen, it’s advised some method of intervention should be applied to increase safety.
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