condition_aggregator_digitraffic 0.0.4

Fintraffic Digitraffic traffic-announcements adapter for the condition_aggregator interface. Maps Finnish traffic announcements to source-neutral Advisory events. Pure Dart.

condition_aggregator_digitraffic

Fintraffic Digitraffic traffic-announcements adapter for the condition_aggregator interface. Maps Finnish traffic announcements to source-neutral Advisory events.

Pure Dart. Only http and condition_aggregator runtime dependencies.

Status

Phase: explore — v0.0.2. Ships against the open Digitraffic traffic-announcements endpoint with point-based bounding-box filtering and integrator-overridable CAP-class heuristic mapping by trafficAnnouncementType.

This is the first adapter under the Nordic-region adapter family; the second is condition_aggregator_met_norway.

Service trace (driver in unexpected snow; ≤4 hops)

Fintraffic Digitraffic traffic-announcements feed
  → DigitrafficAdvisoryProvider (this package)
  → AdvisoryAggregator typed merge
  → integrator HMI surfaces advisory to the driver in unexpected snow
    on Finnish roads

This package exists to help a driver on a Finnish road in unexpected snow — and her family — especially in compound-failure conditions when standard navigation infrastructure has gone away. Adapter-count is not the success metric; integrator pull + driver-relevance is.

Source attribution

v0.0.2 continues to use AdvisorySource.other as a placeholder. The condition_aggregator interface does not yet carry a Finland member; the placeholder follows the enum's own documented "early-scaffold without locking the surface" convention. The AdvisorySource.fintrafficFinland enum-extension upstream proposal fires when a second Finnish-publisher adapter warrants the enum surface change; until then other + the verbatim Fintraffic credit line in Advisory.description carry the attribution load.

Endpoint

https://tie.digitraffic.fi/api/traffic-message/v2/traffic-announcements

No authentication required (Digitraffic swagger v3 security: [], verified 2026-05-24). GeoJSON FeatureCollection response; this adapter filters features whose geometry intersects a small bounding box around the requested point. The 2026-05-24 live response measured ~3.5 MB across 1455 active features.

Mapping (v0.0.2)

Advisory field	Source
source	AdvisorySource.other (placeholder; see above)
eventClass	properties.trafficAnnouncementType (verbatim)
severity	CAP-class via capMapping lookup (see table below)
certainty	CAP-class via capMapping lookup
urgency	CAP-class via capMapping lookup
areaDescription	English announcement location.description + roadName
effective	announcements[].timeAndDuration.startTime (ISO 8601)
expires	announcements[].timeAndDuration.endTime (ISO 8601)
headline	English announcements[].title if present, else Finnish
description	English additionalInformation if present, else Finnish, with verbatim Fintraffic CC-BY-4.0 credit appended

Default CAP-class mapping (defaultDigitrafficCapMapping)

Sourced from the 2026-05-24 live API genchi-genbutsu (5 distinct trafficAnnouncementType values observed across 1455 active features at 08:53 UTC):

trafficAnnouncementType	Live count	severity	certainty	urgency
accident report	711	severe	observed	immediate
general	442	minor	possible	expected
preliminary accident report	158	moderate	likely	expected
ended	143	minor	observed	past
retracted	1	minor	unlikely	past
unobserved future class	-	minor	possible	unknown

Integrators with region-specific risk profiles (e.g., rural-Finland where any general announcement may be driver-actionable in compound-failure-snow conditions) SHOULD override per-event-class via the capMapping constructor parameter. The fallback mapping for unobserved future event-class values is conservatively minor / possible / unknown; integrators MAY override it too.

Usage

import 'package:condition_aggregator/condition_aggregator.dart';
import 'package:condition_aggregator_digitraffic/condition_aggregator_digitraffic.dart';

Future<void> main() async {
  final provider = DigitrafficAdvisoryProvider();
  try {
    await provider.init();
    final advisories = await provider.fetchActiveAdvisoriesAtPoint(
      latitude: 60.17,
      longitude: 24.93,
    );
    for (final a in advisories) {
      print('${a.eventClass} (${a.severity.name}) — ${a.headline}');
    }
  } finally {
    provider.close();
  }
}

Integrator-overridable CAP mapping

final ruralFinlandProvider = DigitrafficAdvisoryProvider(
  capMapping: <String, DigitrafficCapMapping>{
    // Rural-Finland integrator elevates "general" — any active
    // announcement in compound-failure-snow conditions is potentially
    // driver-actionable.
    'general': DigitrafficCapMapping(
      severity: AdvisorySeverity.moderate,
      certainty: AdvisoryCertainty.likely,
      urgency: AdvisoryUrgency.expected,
    ),
  },
);

Composition

final aggregator = AdvisoryAggregator(providers: [
  DigitrafficAdvisoryProvider(), // Finland
  MetNorwayAdvisoryProvider(userAgent: 'your_app/1.0 contact@...'),
  // ... other adapters
]);

License + attribution (binding)

This adapter package code is licensed under BSD 3-Clause.

Digitraffic data is licensed CC-BY-4.0 per Fintraffic Terms of Service (https://www.digitraffic.fi/en/terms-of-service/, verified 2026-05-24): "Fintraffic's open data is licensed under the Creative Commons 4.0 By license." Attribution is REQUIRED at the consumer-facing surface, not optional.

The adapter emits the Fintraffic-required attribution string in the Advisory.description field of every advisory, verbatim per Fintraffic ToS:

Source: Fintraffic / digitraffic.fi, license CC 4.0 BY.

Integrators MUST surface that line at the HMI layer where the advisory is rendered (per-advisory detail, credits screen, about panel — any "reasonable manner" satisfying CC-BY-4.0 §3(a)(2)). The string is also exported as the public constant kDigitrafficAttributionString for direct integrator use.

Modification disclosure (CC-BY-4.0 §3(a)(1)(b))

This adapter transforms the Digitraffic /v2/traffic-announcements GeoJSON FeatureCollection into a CAP-class Advisory typed event. The original Fintraffic data is consumed unmodified; the bounding-box filtering and CAP-class heuristic mapping are derivations of representation (selecting features near a point; ranking severity per event-class), not modifications of the underlying publisher data. Integrators rendering the advisory should treat the verbatim attribution credit line as accompanying both the original Fintraffic data and this adapter's derivative representation of it.

What v0.0.2 still defers (carry-forward to v0.0.3+)

• AdvisorySource.fintrafficFinland enum-extension upstream proposal (fires when a second Finnish-publisher adapter warrants the enum surface change per NDI bylaws Rule 1(c) standing-watch).
• Symbol-class refinement via properties.announcements[].features[] (granular tags like wildlife, road works, weather).
• If-Modified-Since cache-friendly polling.
• package:http RetryClient wrapper.
• Integrator-facing pana score baseline + publish-readiness summary per NDI bylaws Rule 6 (pre-dart pub publish substrate).

License

BSD 3-Clause License. See LICENSE.