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Thanks again for all the helpful comments. So to control the cracking, would a thicker slab (5" or 6") in the narrow section be beneficial? Also, is the type or selection of concrete significant?

Thanks to all for their helpful advice. I would prefer to attach new pieces to existing as not wanting to create a problem on existing pavement which is crack free. If the new piece is doweled in would a control joint be added where the two pieces join?

My project includes adding a narrow strip of concrete (1.5' in width) to an existing drive fabricated of 12' x 12' panels, 4" thick, rebar on 12" centers. In order to minimize potential cracking, what sort of enhancements (high strength concrete, 5" or 6" thickness, extra reinforcement, etc.)...