Road transport is the source of various negative changes in all elements of the environment (air, water, soil, flora and fauna). These changes can result in unfavourable effects on human beings. The most dangerous chemical compounds to be found along roads are: nitrogen oxides, carbon oxide, polycyclic aromatic hydrocarbons and heavy metals. Noise is the most important physical factor. So far, only a few epidemiologic observations have proven that in populations surrounded by heavy traffic roads is there a noted higher prevalence of respiratory system diseases. Some data also indicate the possibility of higher risk of cancer. Exposure of humans to road traffic results, among other things, in psychic discomfort and sleep disturbances.
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