Automated Freeway Performance Measures (AFPM)


The Hawkeye Automated Freeway Performance Measures (AFPM) intelligence module is a comprehensive solution for collecting and visualizing high-resolution data up to 8 lanes in dual direction. Hawkeye AFPM is ideal for identifying bottlenecks in real-time, reliably registering wrong way driving, incidents and congestion. The Hawkeye AFPM comes free of charge with every radar purchase and guarantees immediate freeway performance visibility. Hawkeye AFPM gives you full peace of mind while managing highway operations, no hassle, just access the tools you really need.

Volume / Flow

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Volume/Direction
Direct count of vehicles over an hourly interval, aggregated into a single value from the volume counts of all lanes in a given direction.
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Composition
The Hawkeye radar detects vehicle classes and feeds this chart with data, differentiating passenger cars, bicycles, pickups and vans, short trucks, long trucks and motorcycles.
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PHF/Direction
The peak hour factor (PHF) is the hourly volume during the maximum-volume hour of the day divided by the peak 15-minute flow rate within that peak hour. The values per lane are aggregated and then the calculation is averaged arithmetically.

Density

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Density/Direction
Defined as the ratio between the Flow Rate per direction and the Time Mean Speed.

Speed

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Time Mean Speed
The average of speeds of vehicle, observed passing a point on a freeway. It is a spot based metric. The individual speeds of vehicles are recorded and averaged arithmetically.

LOS

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Level of Service
The Level of Service feature applies a concept for measuring the overall health of the freeway segment, based on the measured density per lane. An A-F grade is assigned to each lane, associated with a count of passenger cars per mile per lane.

Traffic Events

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Traffic Interruptions
An interruption is an event registered when the individual vehicle speed drops to or below 5 mph. The event is time- and lane-stamped and listed in a table chronologically. Additional details testify to the number of affected vehicles and their speed at the drop point.