On Saturday, October 10, 2020 at 11:52:53 PM UTC+1, Tom Crocker wrote:
>
>
> However, I do agree that some explicit code that preferred continuing on a 
> main road to travelling only on a link road where reasonable would be 
> useful.
>

That makes sense - I've learnt from other threads that some decisions in 
OsmAnd are about what will typically be found in OSM rather than what would 
ideally be there.

But out of curiosity I did some rough calculations on the junction shown on 
the right in the original post (it's at  52.90854, 6.00013). If you could 
instantaneously accelerate from 100 to 130 while crossing the junction 
between the off- and on- ramps you'd save no more than 3 seconds compared 
to keeping on the highway. 

But I think there must be a give-way/yield indication at the junction 
because the ramps are *crossing* a slower road. This hasn't been added to 
OSM - if it had been, would that cause a routing penalty big enough to 
compensate for the 3 seconds? Maybe there is also a penalty for having to 
merge back onto the highway.

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