Dynamic Visual Obstruction occurs when one vehicle blocks the sight lines for another road user. This is a common issue at intersections. It often happens when turning vehicles obscure the view for drivers exiting or entering side roads, creating a higher likelihood of crash.
This problem has been recognised for years, particularly at left turn lanes in Australia and New Zealand. Anyone involved in crash investigations has likely encountered cases where a turning vehicle masked the view of a through vehicle.
So, what can we do to address this issue? Here are some effective strategies to reduce the risk of crashes caused by dynamic visual obstruction:
- Changing the intersection form: For example, replacing it with a roundabout to manage movements more safely.
- Slowing the “bullet” vehicles: Reducing the speed of through vehicles to minimise crash likelihood and severity.
- Blocking the turn movement: Removing the exposure to the problematic movement entirely.
- Offsetting the left turn lane: Adjusting its alignment to open up sight lines for all road users which is now part of the Austroads Guide to Road Design Part 4A (see Section 8.2.5)
Addressing dynamic visual obstruction requires tailored solutions that fit the context of each site. What approaches have you seen work well in your experience?
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