A seatbelt system comprising: a seatbelt comprising: a belt portion comprising a lap portion configured to constrain a waist of an occupant and a sash portion configured to constrain a torso of the occupant; and a coupling configured to couple a portion of a vehicle to at least one of the lap portion or the sash portion; a reel configured to receive one of at least a portion of the sash portion or at least a portion of the lap portion; a tension sensor associated with at least one of the coupling, the belt portion, or the reel and configured to generate a signal indicative of tension in the lap portion and the sash portion; a deployment sensor associated with one of the lap portion or the sash portion, the deployment sensor being configured to generate a signal indicative of a length of the lap portion or the sash portion deployed from the reel; an occupant detector in communication with the tension sensor and the deployment sensor and configured to determine, based at least in part on the signal indicative of tension and the signal indicative of the length, whether an occupant is properly wearing the seatbelt, such that the lap portion and the sash portion constrain the occupant; and a motor configured to generate tension in the seatbelt, based at least in part on an output of an event sensor and the occupant detector determining whether the occupant is properly wearing the seatbelt, wherein the event sensor is configured to determine a probability of a predicted collision involving the vehicle. a seatbelt comprising: a belt portion comprising a lap portion configured to constrain a waist of an occupant and a sash portion configured to constrain a torso of the occupant; and a coupling configured to couple a portion of a vehicle to at least one of the lap portion or the sash portion; a belt portion comprising a lap portion configured to constrain a waist of an occupant and a sash portion configured to constrain a torso of the occupant; and a coupling configured to couple a portion of a vehicle to at least one of the lap portion or the sash portion; a reel configured to receive one of at least a portion of the sash portion or at least a portion of the lap portion; a tension sensor associated with at least one of the coupling, the belt portion, or the reel and configured to generate a signal indicative of tension in the lap portion and the sash portion; a deployment sensor associated with one of the lap portion or the sash portion, the deployment sensor being configured to generate a signal indicative of a length of the lap portion or the sash portion deployed from the reel; an occupant detector in communication with the tension sensor and the deployment sensor and configured to determine, based at least in part on the signal indicative of tension and the signal indicative of the length, whether an occupant is properly wearing the seatbelt, such that the lap portion and the sash portion constrain the occupant; and a motor configured to generate tension in the seatbelt, based at least in part on an output of an event sensor and the occupant detector determining whether the occupant is properly wearing the seatbelt, wherein the event sensor is configured to determine a probability of a predicted collision involving the vehicle.