# Mapping Noise from Motorised Transport in the Context of Infrastructure Management
## 2 Materials and Methods
### Testing Ground  
Central to noise mapping is the accurate characterisation of the area being assessed. It is essential to identify potential noise sources and their impact on the designated regulatory regions. In the adopted methodology, communication routes (roads) are treated as linear noise sources within the computational model, the generated noise level of which depends on many factors, such as the following:  
* Geometrical parameters of the noise source (road): type and technical condition of the road surface, cross-section of the road (width of the carriageway, number of lanes, width of the separation lane), location of the road about the ground level (on an embankment, in a trench, at ground level), and location of engineering structures limiting noise emissions (acoustic screens);* Traffic parameters: traffic volume and structure (number of light and heavy vehicles), average traffic speed, type of traffic (smooth, interrupted, accelerated, and decelerating);
* Independent parameters: topography and land cover between the noise source and the receptor point, and meteorological conditions;
* Meteorological conditions (configured in CadnaA): temperature, air humidity, wind speed, and direction. Basic information about the testbed under consideration is presented in Tables 3 and 4. The following assumptions were made for the measurements:  
* Traffic intensity: The traffic volume values on the individual road sections included in the scope of this study were estimated based on the traffic volume measurements carried out on the separate segments of the analysed roads. The 24-h average traffic volumes used in the calculations, categorised into daily and annual numbers of vehicles, are shown in the table below. * Traffic speed: For these calculations, the average speed of vehicle traffic was assumed to be equal to the maximum permissible speed of vehicles at a given time of day. \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Road**} & \multirow{2}{*}{**Road Class**} & \multirow{2}{*}{**Width of Right-of-Way (m)**} & \multirow{2}{*}{**Surface Width (m)**} & \multirow{2}{*}{**Width of Roadway**} & \multirow{2}{*}{**Number of Road-ways**} & \multirow{2}{*}{**Number of Name**} & \multirow{2}{*}{**Type of Surface**} \\  & & & & & & & \\ \hline Droga 1503W: Grodzisk & & & & & & & \\ Maz.—Siesterzef— & & & & & & & \\ Ojzanov, ul. Nadarzynska & & & & & & & \\ \hline Droga 1505W: Grodzisk & & & & & & & \\ Maz.—Jozefina & & & & & & & \\ \hline Droga 1526W: Grodzisk & & & & & & & \\ Mazowieck ul. 3-go Maja, & & & & & & \\ Milanowek, ul. Debova & & & & & & \\ \hline Droga 1511W: Milanowek— & & & & & & & \\ Falecin—Kotowice, ul. & & & & & & \\ Kazimierzowska, ul. & & & & & & \\ Nowowiejska, ul. [PERSON], & & & & & & \\ ul. Debowa, ul. [PERSON], & & & & & & \\ ul. Koscielna, ul. [PERSON] & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Characteristics of the central county roads (width of road lane). \begin{table}
\begin{tabular}{c c c c c} \hline \hline \multirow{2}{*}{**Road Number**} & \multirow{2}{*}{**Street Name**} & \multirow{2}{*}{**Vehicles/Year**} & \multirow{2}{*}{**Length (m)**} & \multicolumn{2}{c}{**GPS Coordinates**} \\  & & & & **in the 1992 System** \\ \hline \multirow{2}{*}{1503} & Grodzisk Mazowiecki—Siesterzen & & & **Start of Road** & **End of Road Section** \\  & Ojzanov & 3,901,120 & 8060 & 472,176.28/ & 467,138.46/617,626.89 \\ \hline \multirow{2}{*}{1505} & Grodzisk Mazowiecki—Jozefina & 4,113,915 & 2870 & 472,031.80/ & 469,229.06/611,540.84 \\  & Ojzanov & 3,901,120 & 8060 & 474,633.94/ & 474,284.26/614,061.16 \\  & Ojzanov & 3,935,795 & 1200 & 472,789.29/ & 473,320.31/612,598.64 \\  & Ojzanov & 4,113,915 & 2870 & 472,031.80/ & 473,320.31/612,598.64 \\  & Ojzanov & 4,113,915 & 2870 & 472,031.80/ & 474,284.26/614,061.16 \\  & Ojzanov & 5,114,380 & 620 & 474,633.94/ & 474,284.26/614,061.16 \\  & Ojzanov & 3,935,795 & 1200 & 472,789.29/ & 473,320.31/612,598.64 \\ \hline \hline \end{tabular}
\end{table}