[Routing] Turn by turn instructions

Nic Roets nroets at gmail.com
Thu Jul 24 22:59:07 BST 2008


Yes, I'm still struggling with Y-junctions. One frequently encountered
version is highway exits / highway splits.

--
I wonder how many drivers get it right when they're instructed to use exit 15 !

On Thu, Jul 24, 2008 at 11:44 PM, Mark Williams
<mark.666 at blueyonder.co.uk> wrote:

> I think line 3, definition of a junction,  needs to be '3 or more
> segments' and forks in the road want taking into account; where a
> Y-shape comes in at, says, 44 degrees either side, this would be quite a
>  pronounced junction & doesn't want ignoring.
>
> My car does like Marcus' one, 'At the roundabout take the nth exit'. The
> record is, I think, 15th!! It needs to count service road exits as well
> as proper ones - this can be confusing otherwise.
>
> It also has an irritating habit on motorways of telling me to turn right
> at every exit (in UK, so this means 'Don't turn left' really). This is,
> clearly, a thing to avoid, so your algorithm looks good!
>
> The other thing I do like is the prior warning; I get 2 icons, one
> saying eg left turn in 5 miles, for the next event, also one warning
> what comes after that - so when you get turn left....in 50 feet turn
> right... it isn't a total surprise.
>
> Mark
>
>
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