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How about structuring it by decade? By engine size, or something else? — Preceding unsigned comment added by 79.65.102.211 (talk) 18:23, 27 January 2016 (UTC)[]
It seems as though someone has assigned "eras" that have no cited source sources. A "safety conscious" era seems to have been pegged to the removal of the Isle of Man TT from the calendar. This had more to do with top riders boycotting the event meanwhile, dangerous circuits such as Opatija and Imatra were allowed to remain on the schedule after 1977. The move to a more safety conscious era came in drips and drabs so, assigning anything after 1977 as being part of a safety conscious era is inaccurate. There are no sources that back up these "eras".Orsoni (talk) 16:12, 10 February 2016 (UTC)[]
