Versions
The TSRGD has undergone several major re-issues and each of these has been amended for minor changes many times before the present series was first published in 1965. (Issues before that covered a former traffic signs system dating back to the early twentieth century which has now been superseded – see TSRGD 1964, below.) The amendments usually just introduce one or two new types of sign or a minor change to an existing one. It's worth noting that innovative signs that are not yet authorised by the TSRGD often start to appear on the roads years before they get TSRGD approval, but until they do, the local authority wishing to use the sign must have it individually approved by the Secretary of State for Transport.
Read more about this topic: Traffic Signs Regulations And General Directions
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“The assumption must be that those who can see value only in tradition, or versions of it, deny man’s ability to adapt to changing circumstances.”
—Stephen Bayley (b. 1951)