Sweeping a 10,000 m² Transit Concourse That Never Closes — A 3-Robot Fleet with an 18-Month Payback

A metropolitan transit interchange put a hard question to us: their concourse never closes, it's always gritty, and the overnight sweep crew was the hardest shift to keep staffed. Could autonomous sweepers hold a 24/7 public floor to standard — and pay for themselves? We ran their real floor plan through the Fleet & ROI Planner. The answer was a three-unit PUDU MT1 Max fleet, sweeping about 10,000 m² a day, with an 18-month payback.

The brief

A station concourse is the opposite of a warehouse floor: it never gets a quiet lock-up, and the dirt is relentless. About 10,000 m² of hard floor — the main concourse, ticket hall, platform approaches, a retail spine and the bus interchange — had to stay clear of tracked-in grit, dust and litter around the clock, with passengers on it every hour of the day.

The constraints were ordinary and unforgiving:

• No overnight window in the usual sense — the busiest zones never fully close; the deep sweep has to fit a short low-traffic lull, with lighter passes through the day around foot traffic.
• Dust and grit, not spills. This is dry-sweep work — a wet scrubber on the open concourse would be the wrong tool. Sealing against dust ingress matters.
• People everywhere. Anything cleaning here has to detect and yield to passengers, and dock itself out of the way to recharge.
• Thresholds and tactile strips. Transit floors are full of edges a small sweeper trips on.

The shortlist

The concourse needs sweeping, so this is dry-sweeper territory — no water, no recovery tank. We sized three genuine sweepers against the same 10,000 m² of sweepable concourse (stairs and escalators excluded, as a separate manual job), the same four-hour overnight deep-sweep window, and on the same basis: each machine's rated coverage derated to a practical figure, applied identically, then the engine's window-duty factor. The MT1 and MT1 Max quote practical cover-mode figures, so they get the ×0.6 derate; the Beetle Pro's 3,240 m²/h is a theoretical maximum, so it gets the tighter ×0.45. No brand sizes off a number the others don't publish.

Sized on full reach of the sweepable concourse over the four-hour deep-sweep window, every option rounds up to a three-machine fleet — so this isn't a "which is fastest" call, it's a "which survives the environment" call. The PUDU MT1 is the value pick: at ~A$26,000 a unit it sizes the same three machines and pays back soonest. We front the MT1 Max because a 24/7 concourse is exactly where its extras earn out: IP54 dust sealing (the MT1 is IPX3), and the seven-hour battery for fewer dock trips across a non-stop day. The Beetle Pro is a capable industrial sweeper, and on capex alone it is the marginal one — at full reach it sizes to 2.02 robots, so it only just tips past two and its third machine is the least earned of the three fleets, yet it is still the most expensive — but it publishes no dust-sealing figure for a dusty public floor, which is the binding constraint here.

The numbers that matter

The fleet math closes cleanly. Sweeping 10,000 m² by hand at 500 m²/h is about 20 crew-hours of open-floor work a day. Each MT1 Max sweeps its ~3,300 m² share at its spec-derated ~1,320 m²/h — under three hours of cleaning, comfortably inside both the four-hour overnight lull and its seven-hour battery, no mid-pass recharge. Three robots, three docks, rolling passes around the clock.

Three MT1 Max units at an indicative ~A$39,200 each (ex-GST) plus multi-zone mapping and commissioning came to about A$122,000 upfront. The robots don't erase the shift — a supervisor and a cleaner still handle bins, escalator landings, stairs, gate lines and the spills a dry sweeper can't — but they displace roughly 6.5 crew-hours a day of open-floor sweeping, about A$228 a day at A$35/hour fully loaded. Across a 30-day month that's about A$6,800.

The pre-deployment estimate was directionally right on labour, but — as always — it understated the value of consistency. A robot sweeps the retail spine at 3am whether or not the last human shift got to it, so coverage held up through the morning peak, which is exactly when a stretched manual crew used to fall behind.

Three lessons from the rollout

1. Map for the traffic, not just the floor. The concourse was mapped in zones with time-of-day rules, so the deep sweep runs in the overnight lull and daytime passes stay out of the peak flow.
2. Docks belong in the dead space. Parked in low-traffic bays near each zone, the docks let a robot top up without ever crossing the passenger stream, which kept dead travel to the dock off the passenger floor.
3. The role becomes supervision. The overnight sweeper operator became a fleet supervisor handling exceptions, bins and the stairs and escalators the robots can't reach — a better job, and the reason the saving is ~A$6,800, not the whole shift.

Would it work for your concourse?

The honest answer is "it depends on your floor area, your traffic pattern and your wage rates" — which is exactly what the planner is for.

• Run your own site through the Fleet & ROI Planner to see the payback on your floor area and shifts.
• Or tell us about your facility and we'll send a vendor-neutral shortlist with indicative pricing.