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    Investigation of noise and disturbance from vehicles crossing cattle grids and examination of options for mitigation

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    Publication date
    2017
    Author
    Watts, Gregory R.
    Pheasant, Robert J.
    Khan, Amir
    Keyword
    Cattle grid; Tyre noise; Road noise; Noise impact
    Rights
    © 2017 The Institute of Acoustics. Full-text reproduced with publisher permission.
    Peer-Reviewed
    Yes
    
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    Abstract
    Cattle grids are used on roads and tracks to prevent grazing animals from leaving an open space without fencing onto a more controlled area where access to the road from surrounded land is more limited. They are widely used in the UK at the entrances to common and moorland areas where animals are free to roam, but also on private drive entrances. Typically, they consist of a series of metal bars across the road that are spaced so that an animal’s legs would fall through the gaps if it attempted to cross. Below the grid is a shallow pit that is intended to further deter livestock from using that particular crossing point. The sound produced as vehicles cross these devices is a characteristic low frequency “brrrr” where the dominant frequencies relates to the bar passage frequency under the tyres. The sound can be disturbing to riders and their horses and walkers and residents living close by as evidenced by press reports and the need to consider noise aspects in planning for new installations. For this reason and due to the lack of available information on the size and nature of the problem measurements and recordings have been made at a number of sites in Yorkshire in the UK. In addition, questionnaire surveys of residents living close by and façade measurements have also been used to gauge impact. Results show that there is a wide variation in the maximum noise level produced by cattle grids of apparently similar design. This can be related to impact noise produced by the movement of all or part of the grid as the frame comes under impulsive loading as the vehicle crosses. It was further established that some residents living close to the cattle grids were disturbed by the noise, and in some cases vibration, and wanted them removed or suitably modified. Means of reducing the problem are proposed.
    URI
    http://hdl.handle.net/10454/11238
    Version
    Accepted Manuscript
    Citation
    Watts GR, Amir K and Pheasant RJ (2017) Investigation of noise and disturbance from vehicles crossing cattle grids and examination of options for mitigation. Acoustics Bulletin. 42(1): 42-50.
    Type
    Article
    Collections
    Engineering and Informatics Publications

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