###### Abstract  
In this study, results from long-term monitoring of the type/road noises of the exposed aggregate cement concrete (EACC) with the highest grain size of 8 mm and stone mastic asphalt (SMA) surface with the highest grain size of 11 mm performed by close-proximity (CPX) method are presented. There are certain concerns that the EACC surface will have inferior noise properties than SMA. These concerns are based on previous experience with the cement concrete surface with transverse timing texture which is very noisy. The main aim of this article is to demonstrate that these concerns are unfounded. A section of the motorway was chosen for the measuring and the testing speed for all measurements was 80 km\(\cdot\)h\({}^{-1}\). Provisional results (based on six years of monitoring) show that the noise levels measured on both these surface types are similar over their lifetime and exhibit logarithmic acoustic behaviour. type/road noise; stone mastic asphalt; exposed aggregate cement concrete; close-proximity method +
Footnote †: journal: Applied Sciences  
**Citation**: [PERSON]; [PERSON]; [PERSON] Comparison of Exposed Aggregate Cement Concrete Surface and Stone Mask Asphalt Surface Noise Emissions by Close-Proximity Method. _Appl. Sci._**2021**, _11_, 10399. [[https://doi.org/10.3390/app11211039](https://doi.org/10.3390/app11211039)]([https://doi.org/10.3390/app11211039](https://doi.org/10.3390/app11211039))  
Academic Editor:  
[PERSON]  
Received: 5 October 2021  
Accepted: 31 October 2021  
Submitted: 4 November 2021  
tyre/road noise already dominates the overall vehicle noise from the speed of approximately 20 km\(\cdot\)h\({}^{-1}\)[29]. The mechanisms of tyre/road noise are very well known and there are a lot of them [27]. The tyre/road noise is then further affected by many factors as well as the pavement texture [30,31], composition of the mixture [32, 33, 34, 35] or type of tyre [36]. The measurement of tyre/road noise is most often done using the close-proximity (CPX) method. Since 2015, CPX has been the recommended method for long-term monitoring of changes in the acoustic characteristics of road surfaces, in line with the recommendations of the CEN/TC 227/WG 5 international working group [37]. The method does not depend on the traffic situation. It is described by ISO 11819-2 [38], which lists the basic measurement and correction requirements. The CPX method is used together with ISO 11819-3 [39], which stipulates the use of a defined reference tyre, and with ISO 13471-1 [40], which sets out procedures for considering the effect of temperature on tyre/road noise. The reference tyre is usually placed onto the wheels of a special trailer pulled by the vehicle in the driving path, i.e., the trailer has a total of two tyres placed in the distance corresponding to that between the tyres of a regular vehicle. If the reference tyre is placed in a special housing serving as an anechoic chamber, the method is described as enclosed CPX [32, 41, 42, 43, 44, 45]. In some cases, measurement is done using only one reference tyre placed in the centre of the trailer [46, 47]. Measurement can also be done using a tyre placed on an uncovered trailer and this method is referred to as open CPX [48, 49]. When comparing the two types of measurement trailers with two tyres, it was found that the results obtained were comparable and the specific results obtained from both types of trailers could be compared with each other [50, 51]. Acoustic aging of road surfaces is a very important problem. Thus, the subject of interest for scientists is the influence of surface aging to noise, which is both practically verified [52, 53, 54, 55] and theoretically modelled [56, 57]. The Transport Research Centre (CDV) has been measuring the noise level of road surfaces using the CPX method in the Czech Republic since 2012.