Exact tagging vs tagging hints
Your proposal seems to mix exact tagging and tagging hints. F.e. that interval seems to be fairly exact in most cases (i.e. 10 minutes) but is just a hint in other cases (i.e. that 12 hours which just means twice a day, or the :evening or :weekend extensions).
I think you should choose between the two. Either you go for the hints, which you could translate to a number of terms like "frequent", "hourly", "daily" "twice-daily" etc (you'd have to make a quantitative research on what times are used, and how you can describe them). The advantage of tagging like this is that it lowers the barrier for tagging.
If you go for exact tagging, I'd try to tag the starting hours in some schema instead of the interval. Together with the average duration, it should give the routing apps quite good hints about whether to use that route or not.
You can have a key "departures", which contains a list of departure times. You could borrow syntax from opening_hours=*, but instead of using continuous ranges (denoted with the "-"), you can have intervals defined in a way like it is done in Matlab, Ruby, or combinations of those syntaxes.
F.e. departures=Mo-Fr 6:15..1:00..22:15 would mean the first bus is at 6:15, then every hour there is a bus, and the last one departs at 20:15. So instead of using startTime-endTime like regular opening hours, it would be firstTime..interval..lastTime. The rest of the values of the syntax can come directly from opening_hours=*.
If you can then tag the duration per route, or maybe the arrival times, or perhaps the duration to go from the start to a certain stop, you basically know the entire schedule.
IMO, only exact tagging justifies the usage of numbers.
- You're right. The interval of 720 and 1440 is not exact and probably difficult to understand. The idea was to allow simple code e.g. using Maperitive with an if-clause for the interval. But I think it is OK to have values like "daily" or "school service". Then everybody knows what that means. The automatic handling of these values gets a little bit more difficult but it is not impossible.
- The usage of exact start and end times creates a big effort especially if the timetable changes. The aim is not to tag the timetable. It should be only a hint for the frequency of the routes. As I said, the intervals have more stability than the streets or tracks the routes are using and are very much more stable than the timetable. So using exact times is too complicated to reach a wider usage. For these purposes we should use separate timetable databases that use OSM as additional visualisation option (e.g. Travic/Geops).
- One word to the justification of numbers. It is a big difference, whether a route departs every 5 or 10 minutes. In the first case the companies need twice as much vehicles and drivers. The same happens between a 3 and 6 minute interval. The effect for the passenger is not that intensive (except overcrowding), but the production effort doubles. That's why I think it is OK to use exact interval numbers.
- --Vicuna (talk) 11:27, 13 June 2015 (UTC)
Interesting idea (I was thinking about this myself, but never posted a proposal), but I think the proposal still needs work. How about the interval at sunday noon or friday evening? What about night time? Maybe combine this with Template:Key:opening hours? -- Skunk (talk)