C-DRONE GUIDE · 21 JULY 2026
Traffic counting by drone: circulation study for a municipality and price
Before redesigning a junction, creating a cycle lane, or assessing how a new housing estate will affect traffic, a municipality or engineering firm needs precise traffic data: vehicle counts per direction, travel times, conflict points between road users. Traditional ground-based counters give an overall flow but little detail on trajectories. A drone hovering above the site films every movement, and once the footage is analysed, full trajectories can be reconstructed. Here is how a drone traffic-counting mission works, and what it costs.
Published on 21 July 2026, reviewed on 27 July 2026 — regulations in force as of July 2026.
What the drone adds compared with a traditional count
A ground-based traffic counter (inductive loop, pneumatic tube, radar) measures flow at a fixed point: it gives a vehicle count and sometimes a speed, but nothing about how road users cross paths, merge or make an unusual stop at a junction. On a roundabout or a complex intersection, that information is missing exactly where it would be most useful for spotting a potential accident black spot.
The drone, hovering above the site, films the whole area from a constant height, with a framing that covers several arms of a junction at once. A review published in the journal Applied Sciences by Kainz, Dopiriak, Michalko, Jakab and Nováková in 2022 details methods for detecting and tracking vehicles from drone-captured images — notably using YOLO-type computer-vision models — to extract detailed traffic data directly from aerial video, without any ground sensor.
How a traffic-counting mission works
The drone hovers at a sufficient height (usually 80 to 120 m) to cover the whole junction or road section under study without disrupting traffic or distracting drivers. The filming session typically lasts two to four hours, timed to the periods most representative of the issue being studied — the morning rush hour, school pick-up time, market day.
The video analysis, carried out after the flight, detects and tracks every vehicle (and often every pedestrian or cyclist) frame by frame, making it possible to calculate indicators impossible to obtain with a traditional counter: inter-vehicle time gaps, occupancy rate per arm, conflict trajectories between left turns and opposing flow, or crosswalk-crossing behaviour. The deliverable usually combines an annotated video, a count table by time slot and a heat map of conflict zones.
Regulatory framework for a hovering flight over a road
Extended hovering over a busy junction or road usually falls under the specific category — the European standard scenario STS-01, which replaced the former French national scenarios S1 to S3 on 1 January 2026 — because of how many vehicles and pedestrians are present. A prior declaration to the DGAC is required, with ten working days' notice: a traffic study must therefore be scheduled well ahead of the desired count date, particularly to time the mission on a representative day (outside school holidays, outside any special event).
The mayor or road manager is usually informed of the flight, even when no formal approval from them is required, if only to anticipate any questions from residents. As with any flight over a built-up area, checking zones beforehand on the Géoportail map remains a standard preparation step.
The price of a drone traffic study in 2026
The price depends on the length of the filming session, the number of points studied and the depth of video analysis. Orders of magnitude observed in France in 2026:
| Service | Observed price (excl. VAT) |
|---|---|
| Count of one junction, 2 to 4-hour session with AI-assisted video analysis | €500 to €900 |
| Full multi-point study with a detailed traffic report | €1,500 to €4,000 |
| Conflict-zone heat-map add-on | +€200 to €400 |
These amounts stay well below the cost of a traditional traffic study requiring several observers posted at once, while producing data directly usable in traffic-modelling software.
Frequently asked questions about drone traffic counting
Does hovering disrupt traffic? No: flown at a sufficient height and outside drivers' direct field of view, a drone has no measurable effect on driving behaviour.
Can travel modes (car, bike, pedestrian) be told apart? Yes: AI-assisted video analysis usually identifies the type of road user, allowing counts broken down by mode.
How long does it take to get the report? Allow one to two weeks between the flight and delivery of the report, the time needed for frame-by-frame video analysis.
Does a drone count replace a traffic engineering firm? No: it supplies high-quality raw data, but interpretation and design recommendations remain the engineering firm's responsibility.