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To help in interpreting results, therefore, the temperature of
the water lying on the road immediately after test should be
recorded. It must be stressed, however, that the change in
state of polish of road surfaces throughout the year is a much
bigger factor determining changes in 'skid-resistance' than is
the change in temperature; the latter accounts for about
one-quarter of the total seasonal change in 'skid-resistance',
which is primarily due to real and reversible changes in the
road surface.
Owing to variations in skidding resistance across the width
of the road, care should be taken in choosing the track to be
tested; the actual position should be recorded for future
reference.
A reminder of the essential data required is printed on the
scale of the tester, and a form for recording the data is
suggested in Table
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