observations of traffic travelling between signal controlled intersections on a 3-lane dual carriageway showed that the dispersion of platoons of private cars was less than that recorded previously in urban situations. an adequate model of the observed dispersion was obtained by making a simple modification to the traffic model used by transyt to estimate dispersion in urban linked traffic-signal networks. the low dispersion found suggests that it is worthwhile linking signals on this type of road over distances of at least three times greater than is normal in town centres. (a).

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