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The paper presents the analysis results of traffic flow measurements recorded by road traffic and noise monitoring station. The station is located in a medium size town in Poland (Kielce) situated at the national road to Cracow. The traffic flow was measured over the period between January and December 2013 for twenty four hours a day. The measurements were documented at one hour intervals throughout the entire 24 hours of the day (1:00-24:00).  
Statistical analysis methods were used to determine the variability and uncertainty of the results.
The measurements from two vehicular lanes running towards the town and two lanes running towards Cracow were analyzed. Different vehicle types were taken into account: cars, trucks, vans and motorcycles. The variability of the results was described using parameters such as the coefficient of variation, positional variation and the quartile coefficient of dispersion. The coefficient of variation and positional variation of traffic were proposed for the analysis of data scattering.

It was found that in some cases the distribution of the tested variable was not normal. Differences in traffic intensity on opposite road lanes for particular groups of vehicles were demonstrated. Box plots were used to assess whether outliers data occurred in the recorded results.
The times of the day in which the parameters describing the variability of the recorded traffic had stabilized values were identified. The results obtained for the data recorded on working and non-working days were compared. Type A uncertainty was evaluated.
Recorded data were used to validate some acoustical urban noise models.