Turning Movement Counts
How to Conduct a Turning Movement Count
A practical setup and review framework for intersection movement data.
By SWAT Alliance Editorial Team · Updated 25 August 2026
Insight at a glance
A short visual checklist for better study decisions.
Use the article as a starting point, then confirm the project-specific scope, method, review and output with the delivery team.
Question
What decision should this evidence help someone make?
Scope
Which locations, movements, classes and periods matter?
Review
How will completeness and definitions be checked?
Output
What format will make the result easiest to use?
Short answer
Conduct a turning movement count by defining the junction, naming approaches, drawing the movement matrix, setting intervals and classes, checking source coverage, then reviewing totals before delivery.
Set up the junction
Use a current layout, label each approach and lane group, mark left/right/through/U-turn paths where relevant and identify pedestrian or cycle crossings that belong in the scope.
Observe consistently
Apply the same movement and class rules to every interval. A vehicle is assigned to the path it actually takes, not the path an analyst expects from the lane.
Validate the matrix
Check that each requested interval is present, approach totals reconcile with movements, class totals reconcile with all vehicles and any visibility gap is documented.
Frequently asked questions
Can a TMC be performed from video?
Yes, when all included approaches, stop lines, movement paths and requested classification cues are visible.
How should an uncertain movement be handled?
Use the approved unknown/exception rule and record the limitation; do not silently assign a movement.
Go deeper
Turning Movement Count Methodology
A practical method for recording left, right and through movements at a defined junction.
Read the technical method →Related services
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