A planner that knows about delays: how Wiesz Kiedy chooses your route

7 November 2026

Why an ordinary planner suggests changes you will miss, and how the Wiesz Kiedy planner calculates routes with current delays, real walking and a realistic transfer time.

A classic journey planner only looks at the timetable. If the tram is due at 17:02 and the bus leaves at 17:05, the planner treats the change as safe, even if the tram is stuck in traffic seven minutes late. Wiesz Kiedy calculates differently.

A route based on what is happening now

When you plan a trip for the next few hours, the planner takes the current delay of every trip in service. In the calculation, a late tram reaches all its later stops later, so:

a change that only works on paper will not be suggested;
a late bus that, by the timetable, has already left may still be catchable, and the planner takes that into account;
the travel time and the moment to leave home (“Leave in 4 min”) include the delays.

Not just the fastest route

The fastest route with three changes is rarely the one people take. So the planner looks for several sensible options:

it drops routes where an extra change saves less than a few minutes;
it shows other lines that get you there at practically the same time, because people often prefer a tram to a bus, or a familiar line to an unfamiliar one;
it lets you choose “fewer changes”, leave out trams or buses, and pick low-floor vehicles only.

Walking along real streets

“As the crow flies” distances can mislead: a stop across the tracks or a river is further than it looks. We calculate walks between stops along real pavements from OpenStreetMap, and the walk from an address to several of the nearest stops at once. The planner picks the stop that gets you there fastest.

How it works inside

Underneath runs the RAPTOR algorithm (Round-Based Public Transit Routing), used in professional planners. It goes through all departures in a time window round by round: first routes without changes, then with one, two and three. In the Android app it runs on the phone, even offline (then from the timetable alone). In the browser version our server runs it in a fraction of a second.

Try it

Open the planner, enter a start and destination and look at the first route: next to the times you will see which trips are on time and which are late. Your city's timetables and lines are on the timetables list.

See when it comes

Planner and departures in 32 cities, most with live vehicles. Free, no account.

Open the planner