With reference to the Cycling England Design Portfolio B.08 relating to access
and speed controls;
A fundamental problem with access control is that whatever arrangement is
used, it will represent a compromise between keeping motor vehicles out and
allowing legitimate users in. The more effective it is in achieving the former,
the harder it is to satisfy the latter. Motorcycles are difficult to control.
Measures that reliably exclude motorcycles invariably exclude many types of
cycle and wheelchair.
Where problems do arise, they can sometimes be overcome by using simple
techniques such as improved information and enforcement, maximising use by
cyclists and pedestrians, and using a sealed surface rather than one which is
unbound. Likewise measures to control motorcycles are only as good as the
weakest point in the route boundary - if fencing can be breached, access
barriers will have little or no effect.
http://www.dft.gov.uk/cyclingengland/site/wp-
content/uploads/2008/10/b08_access_and_speed_controls.pdf
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