What’s ‘app’ with Australia’s ghost buses?

Ever been at a bus stop tracking your bus on a mobile app only to see it disappear rather than arrive?

The developer of real-time travel application TripView thinks he knows what’s happening with these so-called “ghost buses”.

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Most transport apps use GPS data to track buses as they travel along their route.

The system relies on both a device in the bus and real-time information from customers tapping on and off with their travel cards.

Regular bus timetable information and a log of when drivers sign on at work also helps determine the location of buses and when they should arrive.

Collectively this data – in NSW – is the Public Transport Information and Priority System.

The PTIPS data – provided by Transport for NSW – is estimated to be 99 per cent accurate for arrival times, a spokeswoman told AAP.

But sometimes things go awry.

If GPS data isn’t available – for whatever reason – some travel apps revert to using old-school timetable information. Hence you may see a bus approaching when it doesn’t actually exist.

It may have been cancelled or the bus itself switched off when the driver takes a break, for example.

Similarly, if travel-card consoles aren’t working. apps may again switch to showing estimated arrival times.

“From a TripView perspective, a bus should only disappear from the map if there is no longer GPS data for that bus on Transport’s real-time data feed,” TripView developer Nick Maher told AAP.

“I sometimes receive reports of this where it turns out that the bus in question wasn’t providing any real-time data. In this case, TripView would have just been showing the scheduled time.”

A Transport for NSW spokeswoman acknowledged some external apps don’t always use PTIPS data.

“At times they may apply their own logic to interpret (PTIPS) data … which can in turn cause inconsistencies in tracking information,” she told AAP.