Methodology & Scoring Framework

How Travel Risk Calculator computes city-level travel threat, live safety baselines, and binding official advisory floors.

The Live Production Model (Method v2.0)

Every city and country on Travel Risk Calculator receives a composite threat score from 0 to 100 (higher indicates greater risk). Scores are calculated dynamically from five weighted empirical layers using a Root Mean Square (RMS) formula, combined with non-negotiable official government advisory floors.

The Five Risk Layers

Layer	Weight	Scope & Measurement	Authoritative Primary Inputs
1. Security	35%	War, active armed conflict, terrorism, civil unrest, and regional instability.	US State Department, UK FCDO, Government of Canada, and Australian Smartraveller advisories; UCDP conflict battle deaths within 100 km; World Bank political stability indices.
2. Crime & Scams	25%	Street safety, violent crime, opportunistic theft, and documented scams targeting tourists.	UNODC intentional homicide statistics; municipal police crime registries; verified traveller reports; structured local scam patterns.
3. Health & Medical	20%	Endemic disease risks, active outbreaks, emergency healthcare access, and hospital proximity.	CDC travel health notices; WHO disease surveillance reports; OpenStreetMap emergency facility geospatial distances.
4. Natural Hazards	20%	5-year historical disaster exposure: earthquakes, tropical cyclones, flooding, wildfires, and volcanic activity.	GDACS (EC JRC / UN OCHA) event archive; USGS earthquake database; Open-Meteo 30-year historical climate normals.
5. Live Alerts	Surge (+10 max)	Real-time emerging emergency events within 100 km occurring within the last 14 days.	Real-time GDACS emergency feed; regional government emergency decrees; validated news monitors.

The Mathematical Engine: Weighted RMS Aggregation

Unlike simple linear averages where severe danger in one area can be artificially diluted by calm in another, Travel Risk Calculator utilizes a weighted quadratic power mean (Root Mean Square) across structural layers:

      Baseline = √( 0.35 × S² + 0.25 × C² + 0.20 × H² + 0.20 × Z² )
    

If a location suffers from extreme political unrest or severe violent crime, that elevated layer dominates the quadratic mean, ensuring the risk is never understated. Live alerts (R) add a calibrated surge of up to +10 points to reflect immediate real-world threats.

Binding Official Advisory Floors

To prevent statistical models from ever recommending dangerous destinations against diplomatic guidance, strict official advisory floors are enforced in real time:

Floor 75 (Extreme): When two or more official governments (e.g. US State Dept, UK FCDO, Travel Canada, Smartraveller) advise travelers to Avoid All Travel (Level 4) to a country or specific municipal region, the destination score is anchored at 75 or higher.
Floor 65 (Elevated): When one official government issues an avoid-all-travel advisory, the score is anchored at 65 or higher.

Source Admission Gate (SourceGate) & Grounding

Fresh web intelligence is retrieved exclusively through self-hosted SearXNG (with secondary failover to Ollama Cloud). Before any external web snippet can be ingested, cited, or used by our AI synthesis models, it must pass our automated SourceGate filter:

Lexicon & Domain Blocklist: Immediate rejection of adult, gambling, and promotional spam content across multiple languages (including international keywords like bokep, judi, slot gacor, togel).
Geographic Verification: Snippets must mention the target city, its administrative region, or its country. Disconnected regional news is rejected.
Temporal Freshness: Non-evergreen intelligence is restricted to verifiable events within the last 30 days.

Risk Tiers

Low Risk (0–24)

Exercise normal precautions. Strong municipal infrastructure and low baseline crime.

Moderate Risk (25–49)

Exercise increased caution. Common urban petty crime, transit awareness required.

Elevated Risk (50–69)

Heightened vigilance advised. Specific security concerns, scam prevalence, or health warnings.

Extreme Risk (70–100)

Reconsider or avoid travel. Active conflict, violent civil unrest, or official Level 4 advisories.