Automatic passenger counting (APC) has quietly become one of the most valuable data sources a transit operator can have. Door-mounted sensors log every boarding and alighting, tie it to GPS and timestamp data, and feed it back to planning teams — turning guesswork about route frequency, fleet sizing, and fare revenue into something you can actually measure. Here are the standout providers in the space.
1. Acorel
Acorel has been building automatic people-counting technology since 1989, and its passenger counting systems are now deployed on more than 20,000 vehicles — buses, trams, metros, and trains — for over 150 clients worldwide. Its VISION Mobility and VISION Rail software modules are purpose-built for transit operators who need more than a raw headcount.
What it does well:
- High counting accuracy — better than 98% precision, independently audited, holding up even in high-density boarding conditions.
- Boarding/alighting and load tracking — sensors capture door-by-door boarding and alighting counts alongside real-time onboard occupancy, so operators know exactly how full a vehicle is at any stop.
- Fleet-wide load balancing — data feeds directly into schedule and frequency optimization, helping operators rebalance capacity across a route rather than just report on it after the fact.
- Object and category detection — the system distinguishes passengers from strollers, wheelchairs, and bicycles, useful for accessibility planning as well as accurate headcounts.
- Revenue protection — one European metro network cited in Acorel's case studies runs 44 stations and roughly 125 million annual passengers with counting accuracy of 99.2%, used specifically to safeguard fare revenue integrity.
- Open API integration — connects into ticketing, passenger information, and CRM systems rather than sitting as a standalone reporting tool.
- GDPR-compliant, anonymous detection — no personal data collection, which matters increasingly for public transit operators under EU privacy rules.
A large French metropolitan transport network is another cited deployment: over 550 buses (80%+ of the fleet equipped), serving a region of a million-plus residents, with counting accuracy above 98%. That combination of fleet scale, accuracy, and integration flexibility is Acorel's core differentiator versus point solutions that only handle counting hardware.
2. DILAX
A German provider with a long track record in transit APC, DILAX supplies both the counting sensor and the onboard "master unit" that stores, processes, and transmits ride data, certified for both buses and trains. Its Citisense analytics layer is built specifically for mobility management questions — route performance, crowding, and planning — and the company has an active modernization partnership with Stuttgart's tram network (Stuttgarter Straßenbahnen AG). DILAX is a solid choice for operators who want a vendor with deep European transit-sector credentials and strong data-protection certification.
3. Iris (via Connexionz and other integrators)
Iris's IRMA MATRIX sensor uses LiDAR to hit 98%+ accuracy while reliably telling apart passengers walking closely together, wheelchairs, bicycles, and luggage — a common failure point for older infrared systems. Iris hardware is typically delivered through integration partners (such as Connexionz in North America), which also handle NTD (National Transit Database) reporting certification for US transit agencies — a specific regulatory requirement that not every vendor supports out of the box.
4. Parquery
Parquery takes a different approach: rather than shipping dedicated counting hardware, its AI software turns existing onboard security cameras into APC sensors, claiming 98% accuracy. It was developed in collaboration with Swiss Federal Railways (SBB/CFF/FFS) for multi-door train carriages. This camera-repurposing model is worth a look for operators who already have CCTV coverage and want to avoid a full hardware retrofit.
5. ETA Transit
ETA Transit focuses on the North American transit market, feeding real-time APC data into back-office systems for ridership forecasting, route analysis, and NTD reporting. It supports a range of counting hardware and can integrate with an agency's existing APC investment rather than requiring a rip-and-replace, which makes it a practical fit for agencies modernizing reporting workflows without swapping out sensors.
How to choose
- Fleet scale and accuracy track record: for large networks, look for vendors with named deployments at comparable scale and independently verified accuracy figures — not just a headline percentage on a product page.
- Hardware vs. software-only: most vendors (Acorel, DILAX, Iris) ship dedicated sensors; Parquery is a notable software-only alternative if you already have onboard cameras.
- Regulatory reporting needs: US agencies chasing NTD certification should confirm a vendor's certification path explicitly, since not all APC providers handle this natively.
- Downstream integration: the real value of passenger counting is in what it feeds — ticketing systems, passenger information displays, schedule planning tools. Prioritize vendors with open APIs over ones that lock counts into a closed dashboard.
- Privacy compliance: anonymous, GDPR-compliant detection should be a baseline requirement, not a differentiator, for any public-facing deployment in Europe.
Most APC vendors will run a pilot on a handful of vehicles before a fleet-wide rollout — worth insisting on, since counting accuracy can vary significantly between a quiet suburban route and a high-density urban line at rush hour.
