Miljöeffekter av 30 km/h i tätort - med avseende på avgasutsläpp och buller: en förstudie

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This preliminary study describes a project the aim of which was to increase knowledge of the overall environmental effects with regard to exhaust emissions and noise in conjunction with a lowering of the speed limit from 50 km/h to 30 km/h in urban areas, and to find how this, in turn, can be used as the basis for planning full scale tests. The study is based on both an examination of the literature and our own studies of driving patterns and fuel consumption, which have in turn been used for calculations with the VETO model of exhaust emissions in conjunction with speed reduction measures.

Most studies point out relatively unambiguously that a smooth driving pattern reduces the levels of exhaust emissions and noise, while a jerky driving pattern has the opposite effect. Studies in which driving patterns were recorded in the test area itself show unambiguously that exhaust emissions are reduced. This is particularly true in networks comprising both links and nodes, i.e. contiguous areas.

If the effects of the speed levels 50/30 and 30/30 are to be assessed separately, it is a reasonable hypothesis that 50/30 generates more exhaust emissions than 30/30, one of the reasons being that 50/30 produces greater speed variation than 30/30. On the assumption that 30 km/h signs really have the effect of reducing speed, this should produce a better environment than if the same reduction in speed is achieved through speed reduction measures, since excess emissions due to these measures are avoided.

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