Links to other TRL Websites

Popular Links

Latest Content

Current Projects

Snap poll

Stay informed

Discover more about TRL by signing up for news

You’ll receive alerts about world-class reports and real world trials on a wide range of transport, mobility and infrastructure topics. You’ll know when we publish market leading research, unique insights, and fact based analysis.

Be the first to hear our opinion and insight on the future of transport.


Sign up to participate in research about use of UK roads and new vehicle technologies

The results of our research inform government policy, the development of standards, and good technology design.

You may be invited to use our vehicle simulator at Crowthorne, or to use your own vehicle on the road, or simply to complete a survey.

Every trial is different, and provides essential evidence to advance our understanding.

At the heart of everything is our mission to improve safety: your contribution is essential.

Get in Touch

Have a question? Speak to one of our experts today

From the Archives

1957 to present day and ongoing

Overseas manuals and guides

Part of TRL's original mission was to support the post-war British overseas territories in the reconstruction and advancement of their transport infrastructure, so adventurous staff were dispatched far and wide around the globe in the 1950s, to teach local teams and embed core knowledge.  That mission has never faltered, although the contracting route has changed.  In the 1980s the GB Government sponsored production of the Overseas Road Notes - a set of definitive guides to the design, construction and maintenance of roads in tropical and sub-tropical climates.  These are still in constant use and have been regularly updated. The link below takes you to the collection of ORNs. Many nations have commissioned more precise guidance and manuals for their particular environments and training continues via HDM-4. These "low and middle income countries" (aka the global south) may now be the leaders in developing truly sustainable infrastructure as they face investment choices which are easier to implement than the global north countries struggling to balance the needs of their societies with human impact on climate.

Open page of ORNs