M25 motorway and Thurrock off junction 31 (to the east of London). Cobham services opened on 13 September 2012. Originally, the M25 was unlit except for sections around Heathrow, major interchanges and Junctions 23–30. Originally, low pressure sodium (SOX) lighting was the most prominent technology used, but widening projects from the 1990s onwards have all used high-pressure sodium (SON) lighting and this has diminished the original installations. By 2014 only one significant stretch was still SOX-lit (Junction 25–26) and the units were removed the same year. The motorway passes through five counties. Junctions 1A–5 are in Kent, 6–14 are in Surrey, 15–16
M60 motorway 19-24) opening in October. The original plan called for a completely new motorway, but policy change led to the plan which created the current motorway. As soon as it opened, the motorway got close to its projected maximum volume on significant sections. As an orbital motorway, it is equivalent to London's M25 motorway; unlike the M25, the M60 forms a complete loop. In 2004, a section of the northern M60 was the UK's busiest stretch of road, with an average of 181,000 vehicles per day using the stretch between junctions 16 and 17. Usually, the western side of the M25