Government (Japan)
Use Japan Road Traffic Volume from your AI
Query measured road traffic volume on Japanese national routes from the Ministry of Land, Infrastructure, Transport and Tourism's permanent traffic counters (about 2,600 sites), via the free Traffic Volume API operated with JARTIC. Vehicle counts by direction and size class, at 1-hour (about 3 months of history) or 5-minute (about 1 month) resolution, filtered by bounding box and time. No API key is required.
This server connects your AI client to the Traffic Volume API, operated by the Japan Road Traffic Information Center (JARTIC) for the Ministry of Land, Infrastructure, Transport and Tourism (MLIT). It serves directional vehicle counts measured by roughly 2,600 permanent traffic counters (loop/ultrasonic and CCTV-AI counters), mainly on national routes (一般国道).
Key features:
- Query by bounding box and observation time (JST), at 1-hour or 5-minute aggregation.
- Each observation point returns its coordinates, point code, and up/down direction counts split into small vehicles, large vehicles and unclassified, with missing-data flags.
- Retention: about 3 months for hourly values, about 1 month for 5-minute values.
Usage notes: the values are reference values, not official MLIT survey results, and the terms of use require the attribution shown in every response (this server includes it automatically). Query area per request is capped to roughly a city-sized bounding box to respect the API's fair-use rules.
What you need
- An Arlet account
- No API key or account registration is needed. Just switch it on in Arlet.
Choose your AI client
Pick the AI client you use to see how to connect it with Japan Road Traffic Volume.