The World Road Association (PIARC) has recently launched the updated electronic encyclopedia called ‘Road Tunnels Manual‘ focusing exclusively on all the aspects linked to the use of road tunnels (geometry, tunnel equipment and maintenance, operations, safety, environment).

The PIARC Road Tunnels Manual comprises two principal parts: the part ‘Transverse aspects‘ containing 5 chapters and considering general aspects of road tunnels and the part ‘Operational and Safety Requirements‘ containing 4 chapters and addressing particular elements of tunnels taking these requirements into consideration. The Manual ends with a Glossary which describes 200 terms and definitions translated into twenty languages. PIARC Road Tunnel Manual is available in 10 languages.