A carpool consists of two types of participants: "captains" and "members".
- Captains are responsible for creating a carpool application, inviting members to the carpool, submitting the carpool application for approval, full payment of the carpool permit, and financial responsibility for any citations issued to the carpool. Captains can only create one carpool, and cannot join any other carpools.
Members accept email invitations from captains to join a carpool. Upon acceptance of an invitation to join a carpool, any other carpool invitations shall become invalid. Captains cannot submit an application unless at least one member has accepted an invitation to join.