The intersection geometry at crossroads can create a visual phenomenon known as the “see-through effect.” This occurs when drivers or riders misinterpret the road layout, failing to recognise the need to stop or give way due to the straight alignment of intersecting roads. This misperception can lead to serious right-angle collisions.
To lessen the risk of the see-through effect, several infrastructure interventions can be considered:
- Roundabouts effectively eliminate the see-through effect as they clearly delineate the intersection. They’re considered a Primary Safe System treatment for this vehicle-to-vehicle crash type.
- Close the intersection (create cul-de-sacs) – thus removing conflict points. This is also considered a Primary Safe System treatment.
- Raise the intersection so that vehicle speeds are within survivable ranges. Another Primary Safe System treatment.
- Offsetting the intersecting roads (staggered-T) disrupts the visual alignment that contributes to the see-through effect. This is a Supporting Safe System treatment as it still leaves the potential for high-speed right-angle crashes between vehicles.
- Introducing splitter islands within the intersection reinforces the presence of the intersection reducing the chance of misinterpretation. This is a Supporting treatment.
- Implementing a four-way stop sign system provides more time for drivers to assess the situation and avoid potential collisions. This is a Supporting treatment.
- There are a variety of other ways to warn/alert drivers approaching the intersection, these include rumble strips, active advanced warning signs, static warning signs and perceptual countermeasures. These are all considered Supporting treatments.
Which do you think would be best at this intersection?
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