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Narrow bridge sidewalk
excuse is just nonsense

Dear Editor:

i have just read your front
page cover story in Friday,
June 25 edition, on the width
of the cycle/pedestrian paths
proposed in the renovation
work on the Lions Gate
Bridge, and find myself deeply
frustrated and angry.

Angry not so much about
the width of the path being
only two metres as you
describe which is ridiculous
(and T support an increased
width) but with the pathetic

exeuse given by John Doyle of

the B.C. Transportation
Finance Authority — that
“would require higher towers

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and strengthening or replac-
ing the (bridge) cables.”

I am not a structural engi-
neer, and I have every respect
for professionalism, however,
having spent the Jast 50 years
in architecture, I do have
some fundamental knowledge
of structures.

The cvcle/pedestrian paths
each side of the bridge are in
effect cantilevers, and the rule
of thumb is such that a can-
tilever can extend one third of
the distance between its sup-
ports, thus permitting a maxi-
mum cantilever of 3.5 metres.

On the subject of weight.
Here are two components: the
dead toad (the weight of the
structure itself) and = the live
load (in this instance the traf-
fic flowing over the bridge).

Normally the vehicular
traffic Nows with an avcrage of
two vehicular spaces between
vehicles, however, when a pile
up occurs on the causeway,
this is reduced to stationary
bumper-to-bumper traffic, in
effect a trebling of the load. -

Obviously, this is all taken
into consideration in the engi-
necring design, together with
what is known as the factor of
safety, a ratio by which the
known load is multiplied, this
ratio varies as to the type of
structure, but would be at

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least double. (Imagine the
traffic deck completely full
with another load of vehicles
on top it it).

I do not know if Mr. Doyle
observed the foot path several
sears ago (before repairs were
made) where several edges of
the concrete slabs were bent
up, like pieces of burnt roast,
to reveal their total thickness
being less than three inches
(75 mm). But he is now try-
ing to convince us thar an
increase of a metre of this pid-
dling thickness is going to
require the towers to be
heightened!

Society deserves to be pro-
tected from such statements
by people who assume the
role of authority.

The truth would more
realistically represent a lack of
forethought in long-term
planning, just as the two lanes
(in each direction) of the Port
Mann Bridge and the: Deas
Island Tunnel! did in the past,
and also a penny-pinching
attitude after years of decay, in
providing udecz:ate mainte-
nance to the bridge.

If weight is a factor Mr.
Doyle, what are the guard rails
going to be, steel or alu-
minum?

Donald L. Thomas
West Vancouver

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