What you will learn
- How evacuation zones are drawn from fire behaviour and road networks
- How route capacity decides the phasing of evacuation orders
- What evacuation orders, warnings, and advisories each mean to residents
- How traffic and shelter capacity are monitored during an evacuation
- How plans are exercised before fire season, not during it
What the project is
An evacuation zone is a geographic area whose residents leave together when ordered, usually along one or two routes. Zones are drawn from fire behaviour modelling, terrain, road capacity, and the location of vulnerable residents, such as care homes and hospitals. The plan for each zone names its routes, its trigger points, such as fire reaching a ridge or a road, and its destination shelters. The software holds those zones, routes, and triggers, and during a fire it tracks which zones are under warning, order, or all-clear, and how the evacuation is progressing.
Phasing is the critical decision. Ordering every zone at once overwhelms the roads; ordering too slowly leaves residents in the fire's path. The software supports phasing by showing route capacity, current traffic, and shelter availability, so the incident commander can order zones in a sequence the roads can carry. It does not make that decision, but it makes the decision informed, and it records it, so the after-action review can see what was ordered, when, and why.
Core features
Route capacity modelling is the feature. A zone plan without a road capacity check is a map, not a plan.
- Evacuation zone management: zones drawn on the map, with routes, triggers, and shelter assignments per zone.
- Route capacity estimates by zone and road, so phasing decisions reflect what the roads can carry.
- Order management: warnings, orders, and all-clears per zone, with timestamps and the authority that issued each.
- Resident notification integration, so an order reaches the zone's residents through the alert system.
- Traffic monitoring during evacuation, from cameras, sensors, or field reports, showing where routes are congested.
- Vulnerable resident registers: care homes, hospitals, and residents needing transport assistance, flagged per zone.
- After-action reporting: orders, timings, traffic, and shelter use, for review and plan improvement.
How it is built
Build the zones with fire behaviour specialists and traffic engineers, not from a map alone. A zone that ignores road capacity will fail on the day it is used.
- Zone study: fire behaviour, terrain, roads, and vulnerable populations, used to draw zones and their routes.
- Capacity modelling: route capacity per zone, and phasing sequences that roads can carry, tested in simulation.
- Platform build: zone management, order workflow, notification integration, and traffic and shelter views.
- Exercise: tabletop and live evacuation exercises, measuring clearance times against the plan's estimates.
- Pre-season routine: annual zone review, route checks, and resident communication, because zones go stale as housing and roads change.
Tech considerations
The technical core is GIS and capacity modelling. The order workflow and notification integration follow from a zone model everyone trusts.
- GIS-based zone and route management, with version history so a zone change is traceable.
- Capacity modelling tools or integrations, with assumptions visible, because a capacity number without its assumptions is a guess.
- Notification integration with the community alert system, driven by zone order changes.
- Traffic data integration from cameras, sensors, or field reports, with manual update paths when feeds fail.
- Role-based access for fire, police, and emergency management, with audit trails on every order issued.
Challenges to plan for
Evacuation plans fail on stale zones, unmodelled roads, and orders residents do not receive or do not understand. All three are maintenance problems.
- Stale zones: new housing, new roads, and closed routes make last year's zones wrong, and wrong zones misdirect an evacuation.
- Road capacity optimism: a route that looks adequate on a map may have a single-lane bridge or a school zone that halves its throughput.
- Order confusion: residents who do not know their zone, or who receive a warning and an order for neighbouring zones, hesitate, and hesitation kills.
- Shelter mismatch: an evacuation that moves people faster than shelters can receive them creates a second crisis at the shelter door.
Who it is for, and honest limits
This fits fire agencies, emergency management agencies, and local governments in wildfire-prone areas. It fits less well for areas without wildfire risk, where a general evacuation plan without fire-specific zones and triggers is a better fit.
It does not predict fire behaviour or order evacuations. It holds the plan, supports the phasing decision, and records the orders. Fire behaviour prediction and the evacuation decision itself sit with qualified fire and emergency managers.
Frequently asked questions
What is the difference between a warning and an order?
A warning means be ready to leave, often with preparations listed. An order means leave now, by the named route. The distinction must be consistent and public, because residents who treat a warning as an order clog roads early, and residents who treat an order as a warning leave late.
How are zones drawn?
From fire behaviour, terrain, road networks, and population, including vulnerable residents. Zones should be simple enough that a resident can learn theirs, and stable enough that they do not change every year.
How is route capacity estimated?
From road width, lanes, junctions, and known bottlenecks, modelled against the number of vehicles a zone will generate. Estimates carry assumptions, and exercises should test them, because a modelled clearance time that has never been exercised is a hope, not a plan.
What about residents who cannot evacuate themselves?
Vulnerable resident registers flag care homes, hospitals, and residents needing transport assistance per zone, so their evacuation is planned and resourced separately, not improvised during the fire.
How often should plans be exercised?
At least annually before fire season, with a tabletop exercise and, where feasible, a live exercise measuring clearance times. A plan that has never been exercised is an untested assumption about the most dangerous day of the year.