Crediton Street Canyon

Narrow street canyons exacerbated air quality problems in the east of Crediton, modelling of the link road showed that it would alleviate exposure to polluted air

Crediton Link Road

Crediton lies on the A377 Exeter to Barnstaple road and a new link road from the east of the town to the Lord's Meadow Industrial Estate was proposed to address air quality problems. Parts of the A377 form a narrow "street canyon", in which pollutants can become trapped, leading to elevated concentrations and exceedences of air quality objectives.  

We undertook air quality modelling for Devon County Council using CERC's ADMS-Roads commercial dispersion modelling software.  The model was verified by comparing point predictions with monitored pollutant concentrations. Three scenarios (do nothing and two alternative link road routes) were modelled for a number of future traffic flow predictions.  Results were plotted as contours using the MAPINFO GIs software. The results showed a clearly preferable option and indicated that levels of pollution would be reduced to within EU limits.  

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