H.J. Ruskin and R. Wang (Ireland)
Modelling, cellular automata, traffic flow, roundabout, un-signalised intersections
New models for studying traffic flow in urban geometries, (single-lane roundabout and un-signalised intersection) are presented, using one-dimensional deterministic cellular automata model (1DDCA) variants under the offside-priority rule. The single-lane roundabout employs a multi-state CA ring. Each vehicle entering the roundabout is characterised, with specified probability, by a predetermined exit. The un-signalised intersection uses a simple CA, where specific measures of critical gap and headway distribution are not required as for usual gap-acceptance models. The focus in both cases is on driver influence on the standard measures. Driver behaviour at a roundabout or intersection entrance is randomly grouped into categories, defined as conservative, rational, aggressive and reckless. Roundabout and intersection performance is monitored by throughput (the number of vehicles that navigate the roundabout in a given time) and capacity (the number of vehicles passing through a given street of the intersection per unit time). Heterogeneity and inconsistency of driver behaviour for both roundabout and intersection movements are modelled by reassigning driver category at each time step according to the given probability distribution. In both cases, performance can be shown to depend significantly on driver choice.
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