Abstract: Approaches are disclosed for timing the submission of transit signal priority (TSP) requests. A phase selector receives TSP information of a vehicle at a current time, and the phase selector determines an estimated time of arrival (ETA) of the vehicle at an intersection having a traffic signal controlled by an intersection controller. The phase selector determines the arrival phase of the traffic signal at the ETA, along with a phase-relative arrival time of the ETA. The phase selector determines a time to issue the TSP request based on the phase-relative arrival time, and issues the TSP request to the intersection controller at the determined time.

Abstract: Approaches are disclosed for timing the submission of transit signal priority (TSP) requests. A phase selector receives TSP information of a vehicle at a current time, and the phase selector determines an estimated time of arrival (ETA) of the vehicle at an intersection having a traffic signal controlled by an intersection controller. The phase selector determines the arrival phase of the traffic signal at the ETA, along with a phase-relative arrival time of the ETA. The phase selector determines a time to issue the TSP request based on the phase-relative arrival time, and issues the TSP request to the intersection controller at the determined time.

Abstract: Approaches for managing transit vehicle schedules. The method includes determining a current location and current heading of a transit vehicle by a global positioning system (GPS) module aboard the transit vehicle and communicating the current location and current heading to a computer processor. The computer processor determines a current time and current day, and a trip schedule is selected from a plurality of trip schedules in a database. The selected trip schedule has attributes consistent with the current location, current heading, current time, and current day. The method determines whether the transit vehicle is ahead of the selected trip schedule or behind the selected trip schedule. An output signal indicates whether the transit vehicle is ahead of or behind schedule.

Abstract: Approaches for managing transit vehicle schedules. The method includes determining a current location and current heading of a transit vehicle by a global positioning system (GPS) module aboard the transit vehicle and communicating the current location and current heading to a computer processor. The computer processor determines a current time and current day, and a trip schedule is selected from a plurality of trip schedules in a database. The selected trip schedule has attributes consistent with the current location, current heading, current time, and current day. The method determines whether the transit vehicle is ahead of the selected trip schedule or behind the selected trip schedule. An output signal indicates whether the transit vehicle is ahead of or behind schedule.