This Bristol company provides the technology and services for the electronic motorway signs that are so familiar to British drivers. These are supplied to the Highways Agency, Transport for London and Transport Scotland, alongside other products such as traffic control systems and CCTV cameras. In the past year the company has won a contract with Transport for London to implement a new digital CCTV system, which requires no cabling, only a network connection. SSL was founded in 1979. In 1998 managing director Louis Thompson bought it for an undisclosed sum. Sales have grown 57% a year from £5.2m in 2007 to £20.4m in 2010.
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