British Standard BS5489-2: 2016 Code of practice for the design of road lighting, Lighting of tunnels, is the go-to Standard that defines and advises the lighting requirements in road tunnels. However, when is a tunnel not a tunnel? When it’s a short tunnel!. BS5489-2 defines a tunnel as being over 150m in length, but with motorway widening and other infrastructure projects, many highway bridges do not meet the full tunnel lighting requirements but need consideration for all road user groups. This is where PLG09 could be used.
