[Routing] Turn by turn instructions

Nic Roets nroets at gmail.com
Thu Jul 24 22:59:48 BST 2008


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

On Thu, Jul 24, 2008 at 11:59 PM, Nic Roets <nroets at gmail.com> wrote:
> 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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>>
>




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