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The Actuary Lens

A postcode contains several different risks

Location combines several mechanisms that need separate testing.

THE ACTUARY LENS · GEOGRAPHIC RISK

Beyond Postcodes

Location is a container of different risk mechanisms—not an explanation by itself. The public road evidence can test geographic differences and persistence; it cannot establish an insurer pricing lift.

Explore maps and data in Postcode Risk Lab →Read the Beyond Postcodes essay →

INSURANCE IMPLICATIONS

The five conclusions

Test
Direction
Geographic differences may capture several distinct risk mechanisms.
Magnitude
Public road-outcome differences are not insurer pricing relativities.
Timing
Annual evidence supports a held-out geographic study.
Evidence
Authority-level collisions and traffic; not residential policy exposure.
Response
Test before changing portfolio assumptions.

What would change this view? Reassess after decomposed geographic features improve later, held-out claims.

Evidence dates, periods and supporting sources

See the worked framework example
01 · OBSERVED EVIDENCE

Different road outcomes

The approved 2016–2025 authority-level evidence aligns police-reported injury collisions with motor vehicle miles. Compare frequency, serious injury and traffic separately in the Lab.

02 · THE INSURANCE QUESTION

What drives the difference?

A location factor can mix exposure, road environment, behaviour, severity and correlated hazards. A more useful pricing question tests those components individually and asks whether differences persist in later years.

03 · EVIDENCE BOUNDARY

No claims lift claimed

These public measures are not postcode-level insurer claims or resident mileage. A pricing benefit would need held-out claims, credible exposure and governance on an insurer’s own portfolio.

04 · SOURCES

Inspect the evidence

Use the Lab for the interactive maps, annual series, source records and study protocol. Filters from an older map link are carried into the Lab.

Open Postcode Risk Lab →

To explore how road outcomes change over time, continue to Road Risk →

UPDATES

Evidence and assessment changes

Evidence dates

Observation periods and publication dates appear with the supporting sources in Data & sources. A source check records an inspection; it does not make the evidence newer.

Assessment changes

The assessment changes when the evidence justifies a different insurance conclusion. Its change date is recorded separately from source checks and the date this release was published.