How long is the world's longest road tunnel in kilometres?

The world's longest road tunnel is the Lærdal Tunnel in Norway, which stretches for 24.51 kilometres. This tunnel was completed in 2000 and was designed to improve travel times and safety through the mountainous regions of Norway. It includes features designed to combat driver fatigue, including special lighting effects and rest areas. This length is officially recognized, making 24.51 kilometres the accurate measurement for the longest road tunnel globally.