Using numbers
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Using anecdote
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At 60 km/h with a reaction time of 0.75 seconds,
and average deceleration of 0.6 G, a driver will
stop a vehicle in 34 m. At 60 km/h a driver will
chance a crash if another road user has the ability
to enter 34 m of space in front of the vehicle.
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They were only doing 60 km/h in a 70 zone.
Mostly they're are pretty careful.
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On average, drivers took 6.2 level two risks and
4 level three risks on each assessment.
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They take a few risks but no more than other
drivers in their position.
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Emergency drives on average lasted five and a
half minutes. Drivers took 3 or more level three
risks in 31% of the responses.
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You have to accept some risk on emergency cases.
It's pretty rare that they crash. They must be
doing reasonable well.
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Twenty-eight per cent of personnel received
traffic infringement notices for exceeding the
speed limit. One employee received two in two
weeks. On average, speeds were 12 km/h over the
limit. In 80% of cases, the time of the offence was
between 1800 and 2000hrs.
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I know some of them occasionally get a ticket
but its not enough to worry about.
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61% of respondents answered that when personnel
consider they need driver training the organisation
does not help them get the training they need when
they need it.
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We have a great training branch. I suppose
people are happy with the training they are
getting.
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58% of respondents indicated that personnel do
not receive regular information and reminders about
driving standards and issues.
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We send out notices now and then and there is
always info on the intranet.
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The 'eco driver' averaged 15 L/100 km for a
period of two months; 1.5mm of tyre wear; and 0.5
mm wear on the front brake pads. The average for
employees driving identical vehicles performing the
same range of duties was 17.5 L/100 km; 3 mm of
tyre wear; and 0.8 mm wear on the front brake pads.
We have a fleet of 23 vehicles: the potential
savings in eco driving amount to $86 000 in twelve
months.
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Mostly they are reasonable drivers. They could
probably treat the vehicles a bit better but I
don't know if it would make that much difference.
They do have a job to do and we are not that
concerned about fuel costs.
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42 crashes, 80% of which were manoeuvring
incidents, occurred in a six-month period. On
average, vehicles being repaired were off the road
for five days. This amounts to 225 non-operational
vehicle days.
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We have a few crashes, nothing serious. We've
got enough vehicles to cover those off the road.
You have to take these sorts of things into
account.
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The oft-quoted words of Lord Kelvin more than adequately
explain the message in the above table.
I often say that when you can measure what you are
speaking about, and express it in numbers, you know
something about it; but when you cannot express it in
numbers, your knowledge is a meager and unsatisfactory kind.
It may be the beginning of knowledge, but you have scarcely
in your thoughts advanced to the stage of science, whatever
that matter may be.
Numbers will enhance your understanding of a problem -
particularly when the numbers are large. Little things go
unnoticed, but when little things combine they become
meaningful.
