[Talk-transit] catching up

[Peter Miller]

On 10 Jan 2009, at 18:06, OJ W wrote:

> Potentially you might need a routing program just to extract the bus
> route info, if they are only specified as a series of points to
> disambiguate between 'obvious' routes that the bus could take?
>
>
> Do they have to update the 'hinting points' when roads are constructed
> nearby that could provide a shortcut and the bus route doesn't switch
> over to the new roads?
>

If the route is unambiguous then no hinting points are needed and one  
can use a 'micro-journey-planner'.

If there are two potential routes then the 'way points' are needed.  
These are not formally included in NaPTAN and I was at a standards  
meeting in December where there was a discussion about how to add it  
to NaPTAN. For now, if there are a choice of routes then one doesn't  
know which route it takes by using the official schedule data together  
with NaPTAN - one either guesses, or avoids showing the route and does  
a straight line.

Anyway, that is a problem for 'routes' and is out of scope for the  
NaPTAN import.

In the future a new sort of Stop Points may get defined called  
'WayPoint' and in some parts of the country I think the data owners  
might have included fake bus stops to allow proper routing.

Anyhow, I suggest we get a first pass of NaPTAN import does soon (and  
also NPTG) and see how that works and then do another pass and worry  
about H&R and other details then.



Regards,



Peter



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