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So the question becomes, what is causing it to be jagged? I'm still unclear as to the context, and what you mean by 'cars on the road should be smooth not jagged' - conceptually I understand,...

You have several points and want to 'smooth' them...so taking those points and using the general algorithm I described above will give you the benefit of a) 'smoothing' the curves and b) translating...

I presume this would be done using Swing? You could write an algorithm that encompasses Bezier Curves or NURBS...for instance using a sliding window to average out several points then using these...