Different possible trajectories chosen by the driver.Type of vehicle (number of wheels, center of turning circle, dimensions).Bend radius: smaller radii means greater widening.Angle between entry and exit tangent of the bend: the lesser the angle, the bigger the widening.
The point is that there are too many variables to simplify the problem and give a single "one size fits all" value: I suggest using a commercial software such as AutoTURN to estimate the actual additional road widening needed, because the tables provided by wind turbine manufacturers are almost invariably inaccurate and often based on wrong hypothesis. Normally the biggest problems come with the blades. One of the problems frequently found in wind farm project and construction is that road bends with a reduced radius often needs an additional widening to allow the passage of the trucks with the WTGs components.
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