The seven members of the Idaho Transportation Board are appointed by the governor, subject to confirmation by the Senate and statutory requirements regarding state citizenship, residency, party affiliation and geographic representation. None can hold any other elective, appointive or political office, and each must be "well informed and interested in the construction and maintenance of public highways and highway systems." At least one must have special training, experience or expertise in aeronautics. Six members are appointed to alternating six-year terms and represent designated districts; the seventh is appointed from the state at-large to act as chairman of the board; the chairman serves at the pleasure of the governor for an indefinite period (Idaho Code §§40-302 et seq.). The director of the ITD is appointed by the Idaho Transportation Board within broad statutory guidelines for knowledge and experience, and serves at its pleasure (Idaho Code §40-503).