In recent years, many private campgrounds have been substantially upgraded, some offering golf courses, swimming pools and a round of daily activities.
Aviation security has been substantially upgraded since the Sept. 11 attacks, but airliners remain the most alluring terrorist target all the same.
The Clean Air Act held that plants built after 1970 had to have the best emission control technology available at the time they were built, and old plants that were substantially upgraded would have to meet the same standard.
For the initial phase of MAST-U operation the two existing neutral beam injection systems will be used, but must be substantially upgraded to fulfil expected operational requirements.
Earlier the mayor's Cycling Commissioner Andrew Gilligan said: "The old section [Aldgate to Bow] is going to be substantially upgraded and it's going to be fully or semi-segregated for the whole way.
No major system has been substantially upgraded.
New source review requires the installation of the latest pollution control equipment when new power plants, refineries and industrial facilities are built or substantially upgraded.
