Routing algorithms again

[cottonsocks]

Here's another example of nonsensical routing choices being made by our satellite navigation devices. I have uploaded some screenshots which should be available on the following links:-

https://app.box.com/s/emupritrd2pfbe29pw7o4zvcm9smwlns

https://app.box.com/s/9oo9gnix81ixshud76vb74syn3xeah5h

https://app.box.com/s/sxus9n4d08rvn1lagi7xf8ohsl029rt7

https://app.box.com/s/iagto1cstp2dw2uqzhxwavd24di7a88l

They show the route chosen by Garmin Basecamp, the relative differences in journey times (calculated by TomTom's MyDrive route planner, but in reality the difference could be much greater if meeting vehicles coming in the opposite direction) and photographs of the sensible (main road) route and the road chosen by Garmin.

Why, after these devices have been around so long, are they still trying to send us down illogical and potentially hazardous routes like this?

[Allan_whoops]

At a guess because of their classification (B) and that they will be tagged as national Speed Limit, i.e 60.

I still use my Garmin but use Mapfactor on a tablet. That has the ability to choose which type of road to use and a speed limit for each type. I have customised it to stay away from unclassified etc. However, it does cause problems if your destination is on one of those types of road.

[sussamb]

Not sure what settings you're using or even what point you're really trying to make but on my Garmin DriveSmart it routes along the A438 and then the B4208, seems sensible to me

Note BaseCamp will route that way too if you select Avoid residential roads

Moral here is don't always assume your satnav will route the same way as BaseCamp.
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Where there's a will ... there's a way.

[cottonsocks]

[sussamb]

Not like you can in BaseCamp but as I indicated if you try the route on your device it should route along the A road.

You can also adjust the various speeds on different classes of roads in BaseCamp. This might help you get routes more to your liking.
_________________
Where there's a will ... there's a way.

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