Modeling Fire Apparatus Exemptions in Network Analyst for Closest Facility

[chumbi20]

Hi everyone,

I'm working on configuring our ArcGIS Network Analyst model to support Closest Facility analysis for our 911 dispatch system, which is driven by CAD/AVL data.

I've run into a consistent issue: sometimes the closest recommended unit is actually not the fastest unit because the routing model doesn't accurately reflect how fire apparatuses handle one-way restrictions.

There are situations when fire trucks can legally and safely maneuver against the flow of traffic on certain one-way streets (or access them via unique routes like driveways/alleys) when responding to an emergency.

Currently, if a one-way street provides the geographically closest path to an incident, my Network Analyst solver is ignoring it for the unit approaching from the wrong direction, leading to a detour and an incorrect "closest unit" recommendation.

What is the most effective and robust method within Network Analyst to model this exemption?

Specifically, how can I configure a Cost Attribute or Restriction Attribute to effectively ignore one-way restrictions so that the true fastest route is calculated for the closest unit recommendation?

• Should I use a Global Restrictor based on the vehicle type?

Any advice on solving this common challenge in fire/EMS/Police service modeling would be greatly appreciated!

I would love to hear how others have configured their restrictions/costs/attributes for their CAD systems

Thank you!

[JeffSilberberg]

I can't help you directly with this in the Esri Ecosystem, but I do have this site bookmarked, and it may be of help with your overall requirement. 

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https://quickroute.us/

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The US Department of Homeland Security Science and Technology Directorate has a First Responder Group that researches all types of technological innovations that can help first responders. Fire Departments, Rescue Squads, Police Departments, and Disaster Preparedness.

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