Dual-carriageways

Two cars (A and B) are travelling along a dual carriageway. When they reach a certain speed, a stopwatch is started and the distance they travel is then monitored every 10 s over a period of one minute. The results obtained are summarized in Table 1.1 and plotted in Figures 1.5a and b, respectively. In each plot the best line, as judged by eye, that passes through all of the data points has been drawn. 

Approaches to major and minor junctions on dual carriageways and single carriageways where frequent or sudden braking occurs but in a generally straight line... 

Is a wrong-way stagger at a dual carriageway pelican crossing unsafe ... 

Modern dual-carriageway roads are safer by one half compared to traditional dual carriageways. 

Dual carriageways are safer than single carriageways. 

TRL Report 335 Accidents on modem rural dual-carriageway trunk roads,... 

Modem dual-carriageway trunk roads have an accident rate half that of traditional A class roads. 

A vehicle stopped alongside a high-speed dual carriageway is 100 times more at risk than one stopped in a lay-by. 

One in eight fatal accidents on high-speed dual carriageways involve stationary vehicles. 

On rural dual carriageways the relationship extends to petrol filling stations. 

On average, there are more accidents at roundabouts where at least one arm is dual carriageway. 

Likely reduction in injury accidents in darkness on all-purpose dual carriageways — 10%. 

The results of a study of major maintenance schemes suggest that the effect of these schemes on all-purpose dual carriageways is to increase the personal injury accident rate by 14.5%. 

A similar natural experiment occurred in Victoria, Australia. The rural road speed limit was lifted from 100 km/h to 110 km/h on dual-carriageway roads in the mid-1980s, and an increase of around 20% in serious casualty crashes was observed. In response, the limit was reduced to 100 km/h again, and the number of casualty crashes fell by roughly the same proportion. In every individual study seeking to compare crash and injury outcomes before and after changes in speed limits, methodological complications... 

An example of waste rubber powder being used to produce a new road surface on a public road was reported in 2012 [58]. In that article it was reported that Breedon Aggregates, a UK-based company, had resurfaced a short stretch of a dual carriageway in the UK using asphalt that contained recycled ground rubber. The rubber crumb used had been obtained from a Danish company... 

Report 335, Accidents on Modem Rural Dual-carriageway Trunk Roads TRL,... 

Accidents alongside Britain s High-Speed Dual Carriageways AA Motoring... 

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