At the heart of the Safe System is the need to protect road users from crash forces that the human body cannot withstand. Speed is a critical factor for Delta-V which is key in determining injury severity.
The Road Safety Foundation has done some work to synthesise the available research that shows the speeds at which 10% of collisions of different types will be fatal or serious in outcome.

This work has been welcomed by road authorities as the in-depth research is incredibly complicated and not at all accessible for those outside of detailed collision investigation.

Brian Lawton, Road Safety Research and Policy Officer, Road Safety Foundation

Brian Lawton is a technical leader with substantial experience across a vast range of transport-related issues.

He is a highly qualified and capable mathematician with a reputation for high quality research and evidence-led analysis.

Brian leads the analysis for the Crash Risk Mapping report produced annually by the Road Safety Foundation and has worked closely with National Highways providing advice and guidance on a variety of subjects including on the Star Rating of the Strategic Road Network.