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The Hestia traffic app was designed to overcome a chronic challenge in modeling traffic, traffic flow, and traffic emissions of pollution and greenhouse gases. In particular, data on the distribution of vehicle classes (think “size” or fuel efficiency groups) on a given piece of roadway is very limited. Our aim is to overcome that deficiency with citizen science collected data.

Current Problem with Traffic Data

Limitations of on road sector data

The current official fixed traffic counting stations in Flagstaff are limited to 5 stations and often have limited information of the vehicle class distribution.

Limitations of on road sector data
Improving the on road sector data
With the new Hestia Traffic App, community scientists can collect data at many locations
Sub step a
and can collect detailed vehicle class information at each point
Sub step b

The current official fixed traffic counting stations in Flagstaff are limited to 5 stations and often have limited information of the vehicle class distribution.

Limitations of on road sector data
With the new Hestia Traffic App, community scientists can collect data at many locations
Sub step a
and can collect detailed vehicle class information at each point
Sub step b

This data and the onroad modeling we do is part of a larger model effort called "Hestia" which models and estimates all sources of air pollution, greenhouse gases and heat. This includes buildings, factories, power plants, airports, etc. The Hestia model has been applied to multiple cities in the US including Indianapolis, Washington DC, Baltimore, and Los Angeles. With this effort in the Arizona Southwest we will be adding Phoenix, Tucson and Flagstaff to that list. You can read more about the larger Hestia project here.

With this data, we can better model:

Traffic Flow
TrafficVolume

Provide actionable data for cities and ADOT to better understand traffic flows so they can implement changes to reduce congestion and optimize bus routes to avoid traffic and improve access.

Reducing Emissions
Air QualityMonitoring

Provide accurate data for cities to implement changes aimed at reducing emissions (greenhouse gases and local air pollution – think smog!) through better traffic management and city planning.

Urban Heat
Temperature104°FHeat IslandEffect +8°F

Provide accurate data on heat emissions – the urban heat island is partly driven by heat arising from combustion and vehicles are a large source of local heat emissions. In the urban Southwest, this is a large and growing problem.

Meet Our Team

Our interdisciplinary experts are dedicated to transforming urban transportation through innovative data collection and analysis

Dr. Kevin Gurney
Dr. Kevin Gurney
Professor

GHG emissions modeling, climate change science & policy

Dr. Helen Rowe
Dr. Helen Rowe
Associate Research Professor

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Dr. Anna Kato
Dr. Anna Kato
Postdoctoral Researcher

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Dr. Pawlok Dass
Dr. Pawlok Dass
Postdoctoral Researcher

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Dr. Pankaj Sadavarte
Dr. Pankaj Sadavarte
Postdoctoral Researcher

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Dr. Lech Gawuc
Dr. Lech Gawuc
Postdoctoral Researcher

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