Service summary
Turning movement counts measure left, right and through movements by approach, time interval and, when scoped, vehicle or active-travel class.
When it is used
Use it for junction design, signal, access, capacity or operational decisions.
Methodology
Create an approach-by-movement matrix from the actual junction layout before the count.
Inputs and source requirements
Provide a junction plan, arm labels, periods, class scheme, crossings and output layout.
Movements and classifications
Each observed road user is assigned to the approved approach and movement path.
Time intervals
Usually report agreed fixed intervals so peak variation can be reviewed.
Typical deliverables
Movement matrices, interval tables, classified splits where required and method notes.
Quality control
Reconcile approach totals to movement totals and check each requested period and movement path.
Limitations
It records observed movements and does not alone calculate capacity or future traffic.
Privacy and security
Video sources and project files are handled only through approved transfer arrangements.
Frequently asked questions
Can a TMC include vehicle classes?
Yes. The class dictionary and movement matrix are agreed before observation.
Can signalised and unsignalised junctions be covered?
Yes, provided the layout and required movements are visible in the source.
Can a TMC include pedestrians and cyclists?
Yes. Crossings, directions and mode treatment should be included in the approved matrix.
What if an approach is partly hidden?
The affected movement or class follows the agreed exception treatment and the limitation is recorded.