Green Phase Scheduling

Above is a "Consolidation" diagram. The upper pattern represents the service cycle length of the traffic signal before any traffic management occurs. Here, the vehicles are randomly distributed throughout the pattern (Pi) which represents the "Period of the Intersection". The lower pattern represents the platoon as it traverses through the signal. All vehicles are consolidated to within a "net" Green segment (Tng), and therefore transit the traffic signal without having to stop. Tng is part of the Green phase, less the safety buffers Pre Green Safety (pgS) and Safety Following (Psf). The pattern at the signal also includes Red and Yellow phases. Considerable fuel savings, less pollution, less energy consumption are the result of motorists not having to come to a complete stop.

Go-Light is an ongoing mobility deployment (all patent rights reserved) which saves energy through traffic management. FLOW stands for Fast Lane On Warning. Under this paradigm, Green Phase Scheduling tells motorists what speed they should maintain in order to go through the traffic signal while it is in green phase. Green Phase Scheduling is available as four major interoperable types: Emplaced Readout, Mobile Readout, Safety Shut-off, and Sensory Based Adaptive.

Emplaced type involves anything that is passed through roadside equipment or roadside units (RSU/RSE), and could be seen and acted upon as soon as deployed. Mobile Readout (US Patent 8,618,954) includes readout or output as an in-vehicle or on board unit (OBU). Deployed as original or special equipment (OEM; SEM), mobile Readout allows for higher HMI (Human Machine Interface) resolution, not to mention graphics and audio. As long as safety standards are met or exceeded, readouts and messages could come through a multitude of HMI types.

Green Phase Scheduling can also be installed as Sensory Based Adaptive whereby signal phases and timing (SPAT) can be adjusted to further optimize mobility. If a large platoon is detected from one set of directions (i.e. N-S), and traffic is "lean" in the other set of directions (i.e. E - W), the green phases can be expanded and contracted accordingly, thus further optimizing mobility. Sensory Adaptive can open/close phases that apply to sitting traffic as well.


More fuel savings, less pollution, more mobility are all realized by deployment of Green Phase Scheduling. However, the premiere parameter of a green phase scheduler is safety. Along with just ignoring readouts if one were in a traffic jam (obviously where there would be no room for scheduling), a pre-consolidation counter installed at the beginning of the threshold or trap would further increase safety. If the "net" headway (i.e. 'final' headway at the intersection) were deemed too dense, the readouts would be replaced by a safety message or those readouts could also shut off.

While the settings vary between fuel consumption rate (i.e. environment, energy dependence) vs. headway (i.e. safety following distances), there should be no reason why a lone vehicle or small group approaching a signal in an otherwise empty region should have to make a complete stop at a traffic signal.


Motorists should like Green Phase Scheduling because of the dramatic increase in mobility.

Environmentally speaking, this additional component of FLOW technology will reduce pollution output by approximately 30% for each qualified run up; approximately 2.5% upon maximal national deployment; possibly as much as 10%. This savings will happen regardless of whether the vehicles are diesel powered semis and buses or 100 mpg X-prize competitors or coal-plant-fired electric cars.

All citizens should appreciate Green Phase Scheduling because it would reduce dependence on energy reserves.

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For a demonstrating animated map of how Green Phase Scheduling works, go here.