Throughout the measurement period, traffic strength was also
considered, which was defined as the number of vehicles passing
per minute; the vehicles were continuously monitored by a video
recorder. After each sampling session, the videotapes were played,
and traffic density was manually determined, with a frequency of
every 3 min. Diesel–powered heavy–duty vehicles (HDVs), light–
duty vehicles (LDVs) that burn gasoline, and motorcycles were
counted separately to estimate the traffic density by vehicle type.
Throughout the measurement period, traffic strength was alsoconsidered, which was defined as the number of vehicles passingper minute; the vehicles were continuously monitored by a videorecorder. After each sampling session, the videotapes were played,and traffic density was manually determined, with a frequency ofevery 3 min. Diesel–powered heavy–duty vehicles (HDVs), light–duty vehicles (LDVs) that burn gasoline, and motorcycles werecounted separately to estimate the traffic density by vehicle type.
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