v1.23
National Highways · WebTRIS API

Traffic Intelligence.

Select a motorway junction, monitoring site and date range, then explore and analyse National Highways traffic data.

Loading WebTRIS monitoring sites…

Analyse loaded data

Fetch data to begin analysis.
—Total vehicles
—Average vehicles / day
—Average speed
—Busiest 15 minutes
—Data quality

Traffic flow over selected period

Daily flow after active filters.

Typical hourly profile

Average flow by hour.

Vehicle-length mix

Vehicle groups in the selected records.

Average speed by hour

Speed profile across the day.

Traffic by weekday

Compare average flow Monday to Sunday.

Large-vehicle share

Long vehicles (6.6m+) as a share of classified traffic.

AM vs PM peak

Compare filtered traffic during the morning and evening peaks.

Busiest days

Highest-flow days in the filtered period.

Source: National Highways WebTRIS API. Data is processed historic traffic data, not live traffic. The page checks site quality where the API provides it and flags API/service failures without affecting the main Traffic Intelligence dashboard.