Here is a description of the categories and the sort of
sites that they contain:
Barriers: [5] Traffic control barriers…
Intelligent systems: [5] Intelligent traffic control systems…
Markings: [6] Road marking services, paints and equipment…
Miscellaneous: [7] Other sites relating to traffic control…
Signage: [7] Road sign manufacturers and sales…
Signals: [5] Temporary and permanent road signals…
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