20mph zone in the City Centre

Cambridge Cycling Campaign warmly welcomes proposals for a 20mph zone in
the historic City Centre. We have been pressing for this for many years,
and feel that such a limit would be entirely appropriate to the nature of
the area, as well as offering an opportunity to simplify the current range
of faster limits in different areas. We have been pressing for the
inclusion of a small number of additional roads in the plans which will
shortly go out to consultation. To those who would oppose the proposal, we
would ask: under what circumstances is driving at 30mph appropriate or
safe in streets like Trinity Street or Sidney Street?