Shaft is used as a foundation to support mast arm signal pole structure and transfer load from superstructures to deeper firm strata. The capacity of current shaft foundation deployed in the State of Maryland is re-verified due to higher strength requirement against structural fatigue proposed from AASHTO LRFD Specification for Structural Supports for Highway Signs, Luminaries, and Traffic (2015). The primary object of this research is to evaluate the adequacy of the current shaft foundation design procedure. The shaft foundation verification includes embedment length, reinforcement concrete design based on moment and shear, and torsional capacity. For embedment length check, lateral reactions between soil and shaft are verified by comparing analytical method and finite element method. Wind-induced torque is a design concern for the shaft of a single pole structure. However, torsional capacity of the shaft foundation of signal pole structures is rarely mentioned in the current design specification. Therefore, by validating finite element models with analytical method, torsional effect is further simulated to the finite element model