Quickest Route

[paulwilko]

Hello, I have looked on this site and can not find the answer to this.

I got my TTN3 and 2210 yesterday, so obviousy I have a learning curve, but, some of the directions this thing sends me on are nothing short of a disgrace.

Can anybody please tell me the best way to set this thing up so it gives me the best directions with the shortest travelling time. It says it is sorting the "Quickest Route", but as a test of local roads, it quite obviosuly isn't.

Any help would be grately appreciated.

Thanks

Paul

[DavidW]

The defaults normally are pretty sensible - though you do need to be aware that systems like TomTom Navigator do not know where the traffic hold ups are likely to be; they assume instead that you can do a certain speed along each road according to its classification in their map data.

If you expect it to have the knowledge you do about the best routes locally to you, you may finish up disillusioned. However, you can always go against its routing by placing explicit drivebys, by turning off guidance (or muting the speaker), or by simply ignoring directions you're not happy with (it will re-route). Sometimes asking for an alternative route can lead to something better than you started out with.

If there's a particular local road that's appalling and you never want to use it, put an avoid area to block that road.


Obviously there's limitations as to how much information you want to give about your location, but if you can give particular examples of what you think is bad routing, maybe we can help further.



David

[paulwilko]

Thanks for your quick reply David.

I will give you an example from yesterday.

TRavelling back from Middlesbrough heading south.

I have been doing this for years and always go A1, M18, M1. Sounds pretty sensible to me !!

TTN3 did not want to touch the M18 at all.

It sent me on the A1 then onto the M1, which in itself is not too bad but when i asked for an alternative route it sent me all the way down the A1 which is a pretty crappy route

Hope this helps

What should the settings for speeds be ??

Paul

[technik]

If you know the route that you want to take, then just put in avoids for the roads that TTN3 wants to take you on, and then recalculate the route. Quite simple really.

It's been said before on here, that if you know the route already then you don't need to use any navigation programs.

[technik]

[DavidW]

[R1chard]

[Conor]

[hollis_f]

One of the things I was hoping for would be a more intelligent routing system.

When I plot a route home from work the default route is 0.28 hours, 12.0 miles. But that takes me through a closed road.

So I put an avoid on that road and the new route is 0.28 hours and 10.7 miles.

Obviously the preferred route takes a few seconds less time than the shorter route. But, equally obviously, the shorter route is the preferred one (takes the same amount of time and it's 10% shorter). In fact, the route I actually take is 0.31 hours and 10.4 miles.

What I'd like to be able to do it tell TTN that I'm willing to make a compromise between time taken and distance travelled. I'd like to specify the compromise factor - say 0.5 minutes a mile. So a 100 mile journey that took 120 minutes would be preferable to a 110 mile journey that took 116 minutes.

[DavidW]

In that latter case, does enabling Strict routing make any difference?


Tunable routing would be nice - but the routing algorithms used may make such tuning hard to offer, and people may not find the most optimal routes for them even with such options. Indeed, they may leave the tuning options in such a way that makes routing overall worse than default.

What may be more useful would be an option to calculate a few alternative routes and compare them before selecting one - though this also depends on the ability of the routing algorithms to do this, rather than just come up with a single good (but not necessarily the best) route. As it is, Navigator 2 and Navigator 3 might offer a sensible first Alternative. The second Alternative is usually fairly daft and they just get more and more unusable from there on. It's very rare than if you select Alternative that you'll get a route that uses a different main road, for example, where there are two options.


Right now, the only tuning possible is to change the speeds - but that is, I understand, more tuning than many products offer.


No computer routing system can take into account all factors that a human can - no computer system can have the knowledge humans do, particularly about your local area. How, for example, do you code for typical M25 congestion, bearing in mind that some days are better than others? Navigator 3's algorithms are slightly different to Navigator 2's - some routes I drive regularly are slightly different in the new version, and it's not down to corrections in the maps.

If you know a particular route is preferred, use it. At least with Navigator 3 you can add drive-bys if you want to go a particular way.



David

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