MATERIALS & METHODS
Regarding to the number of vehicles and the
traffic load among the rich habitants of the district
one of Tehran and by means of traffic organization
and traffic police center data of the mentioned
district, the traffic situation and the number of
traffic policemen residing in the area were
identified and their location were spotted. Then,
the places that the measurement was supposed
to carry out were located by means of available
municipal maps taken from the traffic organization
and also using four sound level meters (CELL-
450 and Quest-2900) and the amount of which
Leq, L10, L-max and L-min were measured. All the
measurements were done in the peak of traffic
during three months in the highest and the lowest
traffic jam. Measurements were performed at a
distance of zero from the signal stop line. The
traffic jam and composition was taped using a
video camera. The traffic jam during the
measuring time was categorized into four groups
and was recorded in information cards. In each
measuring period, 141 cases were measured and
altogether 282 locations in the main streets of the
district were recorded, which are shown in Fig. 1.
A significant difference between the level of noise
dose received by traffic policemen in the minimum
and the maximum traffic load was recorded (P <
0.05).
In the next step, in order to measure the level
of noise dose received by the traffic policemen,
the measurement was done according to the shortterm
standard and the data collected from analysis
of the traffic policemen job in a short-term period
(1 h). The applied instrument for this research was
CELL-320 for the noise pollution dosimeter. The
measurements were accomplished using the
dosimeters attached to the body of the policemen.
After determining the work stations and directions
and also, the time spent at each station, the system
was installed on the direction for the considered
time lag and the results were recorded. For this
purpose, 79 cases were measured in each period
of time and in two particular times; before and
after the Iranian New Year, Norouz, in 2006.
Furthermore, a questionnaire, as shown in
Table 1, was distributed amongst the elected
policemen containing questions about their
personal characteristic and moods. Also, some
MATERIALS & METHODS
Regarding to the number of vehicles and the
traffic load among the rich habitants of the district
one of Tehran and by means of traffic organization
and traffic police center data of the mentioned
district, the traffic situation and the number of
traffic policemen residing in the area were
identified and their location were spotted. Then,
the places that the measurement was supposed
to carry out were located by means of available
municipal maps taken from the traffic organization
and also using four sound level meters (CELL-
450 and Quest-2900) and the amount of which
Leq, L10, L-max and L-min were measured. All the
measurements were done in the peak of traffic
during three months in the highest and the lowest
traffic jam. Measurements were performed at a
distance of zero from the signal stop line. The
traffic jam and composition was taped using a
video camera. The traffic jam during the
measuring time was categorized into four groups
and was recorded in information cards. In each
measuring period, 141 cases were measured and
altogether 282 locations in the main streets of the
district were recorded, which are shown in Fig. 1.
A significant difference between the level of noise
dose received by traffic policemen in the minimum
and the maximum traffic load was recorded (P <
0.05).
In the next step, in order to measure the level
of noise dose received by the traffic policemen,
the measurement was done according to the shortterm
standard and the data collected from analysis
of the traffic policemen job in a short-term period
(1 h). The applied instrument for this research was
CELL-320 for the noise pollution dosimeter. The
measurements were accomplished using the
dosimeters attached to the body of the policemen.
After determining the work stations and directions
and also, the time spent at each station, the system
was installed on the direction for the considered
time lag and the results were recorded. For this
purpose, 79 cases were measured in each period
of time and in two particular times; before and
after the Iranian New Year, Norouz, in 2006.
Furthermore, a questionnaire, as shown in
Table 1, was distributed amongst the elected
policemen containing questions about their
personal characteristic and moods. Also, some
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