Apologies in advance for the long reply, just doing some reading.
Hansard written responses from 19 Jun 2002 Column 426W (Great Britain, 2002b) indicates the cost
of installing the various crossing types. Pelican, Puffin, and Zebra crossing installations were quoted
as costing £24,000, £27,000, and £7,500 respectively. It should also be noted that the full costs,
including design, anti-skid, and traffic management tend to add substantially to these costs.
This is an important piece of information...
The current Google Maps image is also quite fitting.
Pedestrians need adequate gaps in traffic to
cross a road. In relatively low speed urban
environments (up to around 50km/h) a gap of
4‐6 seconds is adequate for most able‐bodied
adult pedestrians to cross a 7m wide two lane
road. Child and elderly pedestrians may have
more difficulty judging speed and safe gaps in
traffic and therefore will require longer gaps.
Visually impaired pedestrians, wheelchair
users and people with walking difficulties will
require longer gaps of around 10‐12 seconds.
The number of safe gaps decreases with the
increase in traffic volume and hence different
forms of crossing are appropriate for different
sites. The availability of safe gaps can be
determined by site survey and compared with
It should be noted that crossings are an
amenity to aid access and make it easier to
cross a road. The provision of a controlled
crossing will not necessarily reduce collisions
and may even lead to an increase in collisions.
Where a controlled crossing is present some
pedestrians assume that the appearance of
the green man display, or the act of stepping
onto a zebra crossing, gives an assured safe
crossing opportunity and do not keep alert for
approaching vehicles. However some drivers
do not always stop when required to do so
and occasionally pedestrians are injured on
the crossing, or there are nose to tail shunt
accidents on the approaches as drivers brake
suddenly. The provision of good inter‐visibility
between pedestrian and driver.
For anyone truly interested and dedicated to getting to the bottom of this issue, I would recommend a good read of sources 2 and 3 below. Very detailed.
Sources :1 http://content.tfl.gov.uk/shared-zebra-crossing-study.pdf