The Hidden Danger: Truck Under-Run Collisions and How to Prevent Them (2026)

The tragic story of Jayne Mansfield, a Hollywood icon, and her untimely death has left an indelible mark on road safety. Her passing, almost six decades ago, serves as a stark reminder of the vulnerabilities faced by motorists, particularly in the face of large trucks.

In this article, we delve into the ongoing battle for safer roads, exploring the voluntary standards that could potentially save countless lives.

The Legacy of Jayne Mansfield

Jayne Mansfield's death in 1967, resulting from a collision with a truck's trailer, sparked a much-needed conversation about road safety. The incident led to significant changes in American truck design, with the introduction of reinforced bars to prevent vehicles from sliding underneath trailers. This innovation has undoubtedly saved lives, but the question remains: why aren't similar measures being adopted globally?

The Gap in Road Safety Standards

Safety authorities are concerned that road laws worldwide are falling short when it comes to protecting motorists. They advocate for the adoption of a voluntary standard known as "Toughguard," which offers enhanced protection beyond what is currently mandated by US laws.

The EuroNCAP's Warning

Graphic demonstrations conducted by EuroNCAP, the European safety authority, highlight the dangers of "under-run" collisions. These occur when a car collides with the trailer of a truck, often resulting in devastating consequences. EuroNCAP's tests demonstrate that simple upgrades to trailers could prevent many of these fatal accidents, which claim around 400 lives annually in Europe and the UK.

A Comparison of Safety Standards

A comparison between American and European trailers reveals a stark contrast. The US-spec Toughguard system effectively prevents vehicles from sliding under trailers, offering a higher level of protection. In contrast, Euro-spec trailers, as demonstrated by EuroNCAP, "slice directly through the passenger compartment," leading to fatal injuries.

The Call for Action

Euro NCAP's crash safety body has issued a dire warning, urging truck operators to take proactive measures. They advocate for the introduction of voluntary upgrades and retrofitting solutions for existing fleets, emphasizing the potential to save lives.

The Role of Modern Safety Systems

Interestingly, Euro NCAP's testing has also revealed a concerning trend. Some modern safety systems in cars perform poorly when it comes to detecting trucks on the road ahead. This raises questions about the effectiveness of these systems and their ability to mitigate potential accidents.

A Grave Concern

Matthew Avery, Director of Strategic Development at Euro NCAP, describes the threat posed by trailers as a "grave cause for concern." He emphasizes the inadequacy of passenger vehicle structures and restraint systems in the event of a trailer rear under-run, highlighting the unacceptable high fatality rate associated with such accidents.

Final Thoughts

The story of Jayne Mansfield's death serves as a powerful reminder of the need for continuous improvement in road safety. While progress has been made, particularly in the US, there is still much work to be done. The voluntary Toughguard standard offers a promising solution, and its adoption could potentially save countless lives on roads around the world. It is a call to action for all stakeholders to prioritize road safety and implement measures that go beyond the bare minimum.

The Hidden Danger: Truck Under-Run Collisions and How to Prevent Them (2026)
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