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Metrics Glossary

Congestion Metrics


Object Volume

Number of road users detected


Flow (Per Min)

Number of road users detected per min


Total Rights On Red

Number of road users who turned right during a red light


Total Idle Time (s)

Total time spent not moving (at idle)


Total Motion Time (s)

Total time spent moving


Total Travel Time (s)

Idle Time + Motion Time


Avg. Queue Length (Cars)

Average number of cars in a queue (waiting line)


Avg. Queue Length (Feet)

Average length in feet of a queue (waiting line)


Avg. Idle Time / Vehicle (s)

Average non-moving (at idle) time per vehicle


Avg. Travel Time / Vehicle (s)

Average total time time per vehicle


Signal Performance Metrics


Arrival on Green (%)

Percentage of vehicles that arrive at intersection with green light and will pass through intersection with no idle time


Arrival on Red (%)

Percentage of vehicles that arrive at intersection with red light and will pass not through intersection upon arrival


Total Green Time (s)

Cumulative green time during a set time interval (live or historical)


Total Red Time (s)

Cumulative red time during a set time interval (live or historical)


Average Green Time (s)

The average green time per vehicle during the time period set (historical or live)


Platoon Ratio

The proportion of vehicles arriving on green during the amount of green light time (effective green time) of the signal cycle


Effective Green Time (s)

The time during traffic signal cycle which a given traffic movement or set of movements may proceed. Equal to the time during which the signal is effectively green + amber (yellow).


Emissions Metrics


Total Emissions (Metric Tons)

Total CO2 and related greenhouse gases emitted


Emissions/Vehicle (Metric Tons)

Total CO2 and related greenhouse gases emitted per vehicle


Total Gas Consumption (Gallons)

Total gas used by motor vehicles


Gas Consumption/Vehicle (Gallons)

Total gas used per vehicle


Safety Metrics


Near Miss

When 2 or more road users have conflicting trajectories within a certain threshold of PET to be considered unsafe


Average Speed AoG (mph)

Average speed of road user in miles per hour


Time-to-Collison (TTC)

The time it would take for a collision to occur at an instantaneous speed, distance, and acceleration associated with the driver's vehicle and the nearest lead vehicle


Post-Encroachment Time

The time between the moment that the first road-user leaves the path of the second and the moment that the second reaches the path of the first road-user


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