OPEN DATA, EXPLAINED
Data sources & methodology
Government register
Manifest uses the Government of Jersey’s “All Registered Vehicles to end of June 2026” snapshot: 131,032 registrations. Register records do not confirm vehicles are currently in use. First registration is not manufacture year or necessarily the date of arrival in Jersey.
Source: Government of Jersey, opendata.gov.je. Contains public sector information licensed under the Open Government Licence – Jersey v1.0.
Licensed for use under the Open Government Licence – Jersey v1.0.
Website display corrections
Two Volkswagen labels, BETTLE and BETTLE GL, display as Beetle and Beetle GL. Original source labels, V7 model IDs, counts and rarity populations remain unchanged; this spelling overlay does not merge identities. The Mercedes 350 SL and Land Rover 88 historic records labelled Electric in the source are shown with a verification note and excluded from electric/hybrid analytics and savings pending evidence. No replacement fuel is guessed.
Independent interpretation
Manifest is an independent project and is not endorsed by the Government of Jersey. Its model-name normalisation, identity matching, engine-cycle classifications, rarity ratings and researched enrichment are separate from the government’s reported values. The website uses the approved V7 public projection. Original model labels and stable registration/source identifiers are retained; no registrations are deduplicated.
Uncertainty and specifications
Provisional, unresolved and unassigned models retain source labels and have no exact-model rarity. Conflicting capacities, dates and fuel values are withheld from affected public filters. Missing values are unavailable, never silently zero or inferred from a nearby model. Supported specifications apply only to their evidenced recipients, with original units and evidence shown on registration pages. CO₂ source values and researched exact values remain distinct; unknown test procedures do not support ranking or averaging.
Jersey rarity
For each original source category, model share = eligible model registrations / all category registrations. Competition rank = 1 + number of eligible models with a smaller count. Rarity percentile = 1 − (rank − 1) / number of eligible models. Larger means rarer. Ties share rank. Counts and ratings use PUBLICATION_ELIGIBLE_V7 and never change merely because the visitor filters a page. The combined Other browsing category does not merge its underlying rarity populations.
Electric adoption and scenarios
Adoption analytics use explicit electric/hybrid fuel labels with two historic electric-source records held separately pending verification of conversion versus source error. The original fuel values remain unchanged. Hybrids remain separate and do not receive electric-only savings. CO₂ availability is reported as coverage, without averaging incompatible ratings. The CO₂ Explorer explains its annual tailpipe-only scenario, adjustable assumptions and sourced equivalents next to the calculation. Historical active fleets, actual annual driving and cumulative savings are not reconstructed from this single snapshot.
Historical manufacturer origins and geography
The Origins explorer is a cited Manifest research layer matched to exact source make labels. It groups researched aliases into marques and shows both all-category registrations and car registrations. It uses historical brand origin rather than current ownership or factory location. Research coverage and unassigned labels are published on the explorer; country totals describe the researched subset, not a completed census.
Country boundaries and the Jersey coastline use Natural Earth public-domain geography. Modern country outlines provide geographic context for historical notes. D3 7.9.0 is bundled locally under its ISC licence. No map tiles, geocoding service, CDN or external scripts are requested.
Assets and further sources
Chakra Petch is distributed with its supplied SIL Open Font License. Manifest’s original supplied SVGs are retained. Vehicle photographs remain unpopulated; any future imagery and specification source requires its own usage-rights check. Evidence links identify third-party sources without claiming the government’s licence covers them.