Probationary Drivers and Transportation Assistants and Extra Trips. All probationary drivers and probationary Transportation Assistants shall be eligible to sign up for extra trips and the kindergarten sub list. Substitutes may be used for extra trips: (1) in an emergency when a regular or probationary driver or Transportation Assistant cannot be obtained with reasonable efforts; or (2) when no regular or probationary driver or no regular or probationary Transportation Assistant have signed up for the trip; or (3) as described below in Sections 21.5 or 21.6.
