APS throughput is the number of cars an automated parking system (APS) can store or return in a given period, usually expressed in cars per hour, and it is set by how many independent paths the system has and how long each cycle takes.
A simple estimate: throughput is about the number of parallel paths times 60, divided by the average cycle in minutes. Two lifts with a 2.5 minute cycle return roughly 48 cars an hour; four lifts roughly 96. If 100 cars want to leave between 5:00 and 5:30, the system needs to return 200 an hour for that half hour, or drivers will queue. The space count does not change this math. Only paths and cycle time do.
What sets it
- Parallel paths. Independent lifts, shuttles, robots and exit bays that can work at the same time.
- Cycle time. The average time for one store or one retrieval, including transfers and any pallet handling.
- Mixed traffic. Arrivals and departures share the same machines; a garage that is filling and emptying at once has less capacity in each direction.
- Bottlenecks. The slowest shared element, often the entry and exit bays or a single lift between floors, caps the whole system.
How to size it
- Start from the peak demand: how many cars must come out in the busiest 15 to 30 minutes.
- Convert that to an hourly rate and divide by cars per path per hour to find the number of paths needed.
- Add redundancy so the peak can still be met with one machine out of service.
Ways to raise it
- Add lifts, shuttles or robots rather than adding speed to existing machines.
- Add exit bays so returned cars do not block the next one.
- Use pre-requests and departure aware storage to spread the peak.
The Parkonomics view
Throughput is the number that should drive an automated garage design, and it is the one most often left out of the pitch. A system sized by space count with throughput as an afterthought will fill beautifully and empty badly. Ask for the peak hour model first, and make it part of the contract.
Related terms: Automated Parking, Retrieval Time, Shuttle Parking System, Tower Parking System, Peak Demand Parking Facilities
Further reading: The Evolution of U.S. Parking Structures in 2026