|Indicates the arrival frequency of a public transport route. Use "HH:MM:SS", "HH:MM", "MM", or "M" format.|
|Used on these elements|
|Status: in use|
|Tools for this tag|
The key interval=* indicates the "interval", or "time between departures at any given stop" of a public transport route, also known as headway. This can be used on ferries, buses, trains, light rail, and any other public transport route relation .
The interval should either be in one of the following formats.
HH:MM:SS, HH:MM, MM, M ("H" = Hour, "M" = Minute, & "S" = Second)
This means that a bus route with departures arriving every 1.5 hours at any given stop would be given the tag interval=01:30 (or alternatively interval=90 or interval=01:30:00). A bus route operating every six minutes should have the tag interval=6 (or alternatively interval=00:06 or interval=00:06:00).
This value of interval does not need to be exact. It represents a rough estimate of how often public transport services run, and does not provide full schedule information.
This tag is used on public transport routes (type=route ), and not on bus stops or platforms. Adding the tag to route master relations (type=route_master ) is possible as well, but only if all variants (directions) of the route have the exact same interval tag, which is rare.
|Situation||Tagging||Explaination of tagging|
|A bus route that operates Mo-Fr 08:00 to 18:00 with an interval of ...
interval:conditional=00:20 @ (Mo-Fr 10:00-16:00),
|The main interval is 00:10 minutes, with reduced service from 10:00-16:00. The normal opening hours are expressed with the existing tag opening_hours=*. Note that the conditional tag overwrites the interval tag.|
|A subway route that operates 24/7 with an interval of ...
interval:conditional=00:05 @ (Mo-Fr 07:00-10:00); 00:05 @ (Mo-Fr 16:30-19:00); 00:30 @ (Mo-Su 22:00-05:00),
|The main interval is 15 minutes, with exceptions for both rush hours and the night.|
|A ferry route that operates every hour from 07:00 to 19:00 each day.||interval=01:00,
|The interval is 01:00 during the day with opening hours of 07:00-19:00.|
|A railway route that operates:
interval:conditional=00:10 @ (Sa-Su 06:00-22:00),
opening_hours=Mo-Fr 06:00-23:00; Sa-Su 06:00-22:00
|The main interval is 6 minutes, with an exception of 10 minutes during the weekend.|
Ferry routes mapped as ways
Many ferry routes are mapped as single ways connecting both ports served by the ferry. In this case, the tags interval:forward=*, interval:backward=*, interval:forward:conditional=*, and interval:backward:conditional=* should be used to describe the intervals of forward and backward directions of the route. interval=* and interval:conditional=* can be used only if both directions have the same rough interval.