Viewer

The Viewer module lets you visualise traffic data on an interactive map with various data sources and display options.

Viewer types

The Viewer supports two different viewer types (when available):

Normal

The standard viewer for visualising traffic data with extensive configuration options. This viewer provides:

Filter panel with map layers and additional display options
Charts for detailed data analysis
Search functionality for specific locations
Time and date selection with a slider
Generate a video of the current map view over a time series

IM (Incident Management)

A specialised add-on for managing and viewing traffic incidents. This viewer has:

Automatic refresh of incidents
Integrated alerts panel
Filter options for incident status
Limited map layer selection and filters

The filter panel on the left contains the map layers and additional display options.

Map layers

The Viewer supports various map layers that you can turn on and off:

Volume/speed: Shows traffic volume and speed data
Travel time: Visualises travel times on routes. Includes a prefix filter to show only travel times with a given prefix.
Waze: Shows Waze alerts with category filter options. Available alert groups are:
- Accident (major): Major accidents
- Accident (other): Other accidents
- Car stopped on road: Vehicles stopped on the road
- Hazard on road: Various hazards on the road (ice, oil, potholes, etc.)
- Broken traffic light: Traffic lights that are not working
- Car stopped on shoulder: Vehicles stopped on the hard shoulder
- And more… You can select multiple alert groups to filter which Waze alerts are shown.
Incidents: Display of traffic incidents with category filter options. You can select multiple categories to control which incidents appear on the map.
VMS panels: Variable message signs (DRIPs)
Matrix signs: Matrix Signal Installations (MSI) with options for blank displays and green arrows
Bridge status: Bridge status (with option to show closed bridges)
Parking: Parking information
Public transport: Public transport data
Roadworks: With delay filter options
Rain radar: Precipitation on the map
Hectometre signs: Hectometre values including direction and DVK letters

Additional display options

Below the map layers in the filter panel you will find additional display options (only available in normal mode):

Reference type

For travel time and volume/speed layers you can choose between:

Absolute: Display values relative to the maximum speed, free-flow travel time, or maximum segment speed. Use this option to see all delay, including regular peak periods.
Regular: Values relative to the regular traffic situation. Use this option to detect disruptions or incidents.

Traffic flow

Set the flow percentage with a slider (20%, 40%, 60%, 80%, 100%). For example, at 20% only delay is shown, and at 100% everything (with data) is shown.

Other

Show locations without data: Shows locations where no data is available
Show shapes with errors: Shows shapes with errors (travel time only).
Map matching of trajectories is not always perfect, so some trajectories may be drawn incorrectly. These are hidden by default, but can still be shown.

Search element

Search for specific elements on the map by entering an ID. Only volume/speed or travel time data is searched.

Date and time selection

Use the control panel below the map to:

Select the date (with arrows to move one day forward/back)
Set the time with a slider
Step through time (1 minute, 5 minutes, 15 minutes forward/back)
Return to the current time (circular arrow)
Enable automatic refresh (circular arrow with A)
Generate a video of the current map view (video camera icon; Viewer only, not available in Monitor)

When the current day is displayed, only a time up to the current moment can be selected. There is a break in the time bar at the current time.

Generate video

Generate video creates a short MP4 of the current map view and filters over a time series. The video uses the visible map viewport; zoom and pan define the area.

Set the desired map layers, filters, and zoom
Click the video button in the control panel below the map
Choose the settings in the dialog and start generation
The video is downloaded as an MP4 file when generation finishes

Settings

Time step: Interval between consecutive map images (1, 5, or 15 minutes)
Date: Follows the date already selected in the Viewer (not chosen separately)
Start: Start time of the series
Time window: Slider for the length of the series. Maximum 61 images; the maximum coverage depends on the selected time step (for example 1h at 1 min, 5h at 5 min, 15h at 15 min). Below the slider you see start–end, coverage, image count, and estimated wait time
Playback speed: How long each map image stays on screen in the video (1 image every 2 seconds, 1 image per second, or 2 images per second)
Resolution: 720p, 1080p, 1440p, or 4K. Aspect ratio follows the map window; higher resolution can be slower and heavier

Important

The end time must not be in the future. Otherwise choose a shorter time window or an earlier start; the Start generating button is disabled in that case
Do not resize the window while generating (that can distort the aspect ratio in the video)
During generation the map is frozen; you can cancel via the progress bar

Charts

When normal mode is active, you can display charts by clicking the chart button on the right, in the middle of the map. The charts show:

For the volume/speed layer:
- Volume (veh/hour)
- Speed (km/h)
For the travel time layer:
- Travel time (minutes)
- Segment speed (km/h)
For the parking layer:
- Occupancy (occupied spaces per hour), including:
  - Expected: Average occupancy for the same weekday over the selected number of weeks
  - Today (or the selected date): Occupancy for the selected day
  - Capacity: Reference line for the facility capacity
  - Now: Current hour highlighted when the selected date is today
For the bridge status layer:
- Unavailable for road traffic (minutes per hour), including:
  - Expected: Average unavailable minutes for the same weekday over the selected number of weeks
  - Today (or the selected date): Unavailable minutes for the selected day
  - Now: Current hour highlighted when the selected date is today
- Openings on selected day: Table of openings with start, end, and duration. Columns are sortable. A summary shows the number of openings and average, minimum, and maximum duration. Use Go to timestamp to jump the Viewer time to the middle of an opening.

Configure the charts with:

Period: Select aggregation period (1 minute, 5 minutes, 15 minutes, 1 hour). Only available for volume/speed and travel time.
Days for day pattern (same weekday): Number of weeks back for comparison (0–52 weeks). The average day is calculated based on the same weekday (for example all Mondays) within the selected number of weeks. For parking and bridge status this sets the expected profile.

Click a location on the map to view the chart for that location.

Selecting overlapping NDW segments

When several NDW segments are close together and run in the same direction, clicking them opens a chooser:

Only segments matching a selected prefix are shown as candidates.
Hover over a candidate to highlight its segment on the map.
Click a candidate to select the segment and open its information and charts.
When there is only one matching segment, it is selected immediately.

Getting started

Select a viewer type (if both are available)
Enable the desired map layers via the filter panel on the left
Configure the additional display options if needed
Set the date and time
Use filters to view specific data
Click locations on the map for detailed information or charts
Optionally: generate a video of the current view over a time series