TM 9-2320-211-20
NOTE
Insure that these vehicles are not used
without permission after duty hours.
(4) Traveling time. Traveling time is seen
from the broad band of the time recordings and
corresponds to time spent at the wheel. Total time
traveled can be added up with the analyzer. It is
important in calculating the average speed and
determining the driving manner.
(5) Stationary times. The thin concentric line
denotes a stationary vehicle. The stationary time
can be determined precisely by using the chart
analyzer. This is done in a single operation which
a l s o determines traveling time. In the case of
p r i m a r y local use, there may be considerable
stationary time. Some reasons for long stationary
periods are:
(a) Loading and unloading.
(b) Waiting at loading bay.
(c) Repairs, servicing, and refueling.
(d) Pauses in work.
d. Chart as Data Source.
(6) D e g r e e o f u t i l i z a t i o n . T h e d e g r e e o f
(1) General. The chart disc provides valuable
utilization is the ratio of traveling time to total
statistical information on driving, from which all
operating time.
Traveling time X 100%
Degree of utilization =
essential data for testimonies can be obtained. The
r e s u l t s of evaluation give clear answers to all
Total time
questions relating to vehicle use. For example:
Vehicle load should also be taken into account
(a) Time percentage of vehicle utilization.
when computing degree of utilization.
(b) Number of stops and length of stops.
(7) A v e r a g e s p e e d . T h e a v e r a g e s p e e d i s
(c) Excessive speed.
calculated from data taken from the chart.
(d) Excessive engine idling.
=
Miles traveled X 60
Average for journey (mph)
(e) Correct warm up, correct shut down.
(f) Driving in proper rpm range.
Total time (min)
(g) Overrevving.
Miles traveled X 60
Average
driving
mph
=
(h) Lugging.
(i) Total engine rpm compared to total
Actual driving time
miles.
(min)
The tachograph automatically provides in-
The closer the ratio approaches 100%, the more
formation on all these factors on the chart. The
recordings have only to be correctly evaluated.
economical is the manner of driving. As a general
g u i d e , the minimum value for local transport
(2) Time range for evaluation. The extent and
s h o u l d be 50-60 percent while the percentage
time required for evaluation depends on the data to
should be higher for long distance work.
be processed. A detailed operational analysis need
not be carried out over a whole year. For example,
(8) Applicable speed limits. Maximum speeds
are prescribed by law. Check the chart from time to
evaluation can be made over an uninterrupted
time to see that these limits are actually being
period of about one month, then extrapolated over
observed.
the year to figure the degree of utilization of a
(9) Distance traveled in miles and kilometers.
vehicle. For a thoroughly detailed analysis using
Distance covered is found from the visible distance
auxiliary devices, a time of one to two minutes per
c o u n t e r or from chart notations. The mileage
chart is required.
counter section of the distance recorder counts all
(3) Working times. The chart is inserted at
the start of duty hours and removed at the end of
miles traveled even when the tachograph is open.
The day's journey or any partial journey can be
duty hours. The beginning and end of the recor-
determined from the chart. At the start and end of
dings must correspond with those hours. By adding
the journey the distance recorder figures must be
up the partial times marked by the red band of the
time during duty hours can be determined. The
entered in the inner field of the chart. The dif-
thin line recordings indicate pauses or breaks.
ference between the two values must coincide with
