FDOT has freeware for signal poles on a single pile.
Respect footings, the question is more than anything to meet the allowable stresses.
I understand the push for economy that drives everyone, but for single items like this is scarcely worth. A proper training should produce designers able to do this design without any doubt. What we can't do at one forum like this is to preovide a complete engineering design for some requested items.
Respect bolts and so on, usually anchor bolts are embedded to the footing, then the pole is leveled to stay vertical, and the nuts locked to this position. A plate or more complex design ensures proper transfer of forces between pole and foundation through the bolts.
Wind is a dynamical solicitation and many bolts anchoring signal poles with big panels get broken. In some codes, friction bolts are required never permitting the interface to lose contact are mandated. In all cases, to reduce the stress range in tension will enhance the (fatigue) life of the bolts. To use ductile nuts will also help against their failure in fatigue.