TRRL has monitored a lorry control at Lymm, Cheshire which has diverted some 220 heavy lorries per day, many carrying dangerous loads, away from the narrow, tortuous and hilly roads through the village. Although the main aim of the control is to reduce the possibility of major accidents involving large vehicles carrying hazardous loads through Lymm it has not proved possible to evaluate its effect on the probability of such accidents occurring there or elsewhere. The diverted vehicles now use better, but longer, routes at an extra cost to operators averaging about £1.50 per one-way trip and totaling nearly £100000 annually. They now pass more dwellings than formerly but, in general, the individual hgv flow increases are less than the individual flow decreases and are on roads which already carried much greater total traffic flows. (Author/publisher)
Abstract