The present invention is a method and system to verify carpool occupancy compliance for access to High Occupancy Vehicle (HOV) lanes, High Occupancy or Toll (HOT) lanes, or other vehicle-occupancy contingent rewards and other incentives. The present invention uses software and hardware devices with radio-frequency transmitter modules to permit the determination of rewards or incentives based upon meeting thresholds of occupancy, verification of use, or number of points accrued. This driver-rider co-location is performed via push notification and server analysis of driver and rider GPS data. Alternatively, co-location is performed using a combination of GPS data analysis and photographic analysis. Occupancy compliance rewards can be communicated directly to the driver and riders within a vehicle.