67. If the director general is absent, or is unable or refuses to act, the board of directors shall appoint a person to replace the director general temporarily.
However, the internal by-laws of a transit authority may provide for a temporary absence of the director general and authorize the director general to delegate all or part of the powers and functions to a person the director general chooses. The by-law may determine the maximum period of temporary absence, not to exceed six months, and the conditions for the validity of the delegation.