International Road

[matt_e]

I've just been tweaking my road speeds. Are there any definitions of what TTN2 regards as the various road types e.g. connecting road, secondary road?

Are there any International roads in the UK? Is a B road a secondary Road? What's an important local road vs a normal local road???

Think I've found some decent settings but would like to know what the settings mean!

[DavidW]

The best thing to do is to follow some advice I've posted before.

Choose a chunk of map where you know the roads well. Zoom in to a relatively large scale, then open the legend. For a start, it's often the case that road types that aren't on that map are greyed out in the legend. Meanwhile, at a sufficiently high zoom, you can tell the various types apart more easily than at a lower zoom. Some types differ on-screen only in the width of the lines.

Does that help?



David

[matt_e]

Hello David,

Thanks for this. I have done as you say but although I can see the diffference between most roads, I can't see the difference between an International Road and a Main Road. Furthermore if I set the speed of an International Road to something ridiculously high like 90mph then it makes no impact one the route chosen. I am assuming therefore that there are no International Roads in the UK???????

My reason for experimenting is that I can't get TTN2 to pick a decent route on 2 different routes from central London to the periphery. On one route the A road is like a motorway. On the other the A road averages about 20mph. Even with 1mph increments, I can't find the correct settings that work on both routes as I either get routed through miles on end of slow A road or I get routed round many many extra miles to go on a motorway.

For many routes I suppose you have to say that TTN2 will get you there but often it will NOT choose the fastest or best route. Sometimes it works, sometimes not. Until TomTom enable a greater range of classifications on road type speeds this problem won't be resolved. I assume it's the same for all road nav apps. I have posted in the TTN2 wishlist my ideas on how to resolve this but maybe even breaking it down to A roads that are dual carriageway would make some impact on the accuracy on route planning.


Let's hope for something like this in TTN3!

Matt

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