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This is a set of issues we're dealing with the OpenTripPlanner tool of relevance to the OSSTIP project.
Concerns with accuracy of OTP Analyst Isochrones in late evening or overnight
Status: Emailed to OTP mailing lists, created issue on Github, possible code debugging needed.
See mailing list posts:
Concerns about maxTransfers value too low by default
I've been using OpenTripPlanner as part of a research project to propose improvements to Melbourne, Australia's public transport network - and its shaping up really well so far.
A concern that arose today though from a transport planning perspective :- it appears the default value of maxTransfers=2 in the RoutingRequest class ?? I discovered this when doing some batch analyst tests and it was giving a -1 trip time value for several trips until I increased this parameter.
As a public transport-oriented researcher and advocate for sustainable transport I'm just a bit concerned with having a max transfer this low by default.
The reason is that a strong theme of research into transport best-practice in recent years is that for transit to compete with the car in terms of coverage, we need to plan entire networks that _do_ sometimes require several transfers to access all of a large urban region - but the transfer times should be minimised using pulse timetables or high-frequency services. See e.g. http://www.newsouthbooks.com.au/books/transport-for-suburbia_beyond-the-automobile-age/ or http://www.humantransit.org/2009/04/why-transferring-is-good-for-you-and-good-for-your-city.html
So could I suggest at least 3 as the default?? What do other users think?
I know its just a value that can be overridden in the application-context.xml :- but in my experience as a developer and scientist in computational modelling, default parameter values really do matter ;)