I made a test:
with profile car I got 
431 km, calculated duration 3h58
With special profile truck
431 km, calculated duration 4h01
so I the truck was only 3 minutes slower.
The changed speed data are:
(example truck=80, car=110)
so I think the speed reduction has only a very small effect, it is to much 
work for 3 minutes.

            <!-- most important backbone roads -->
            <select value="80" t="highway" v="motorway"/>        <!--@PB 
car= 110 -->
            <select value="80" t="highway" v="motorway_link"/>    <!--@PB 
car= 110 -->
            <select value="70" t="highway" v="trunk"/>          <!--@PB 
car= 100 -->
            <select value="50" t="highway" v="trunk_link"/>        <!--@PB 
car=  75 -->

            <!-- generally linking larger towns -->
            <select value="50" t="highway" v="primary"/>        <!--@PB 
car=  65 -->
            <select value="30" t="highway" v="primary_link"/>    <!--@PB 
car=  50 -->
            <!-- generally linking smaller towns and villages -->
            <select value="40" t="highway" v="secondary"/>        <!--@PB 
car=  60 -->
            <select value="30" t="highway" v="secondary_link"/>    <!--@PB 
car=  50 -->
            
            <!-- important urban roads -->
            <select value="40" t="highway" v="tertiary"/>        <!--@PB 
car=  45 -->
            <select value="35" t="highway" v="tertiary_link"/>    <!--@PB 
car=  40 -->




Am Montag, 29. Januar 2018 15:22:54 UTC+1 schrieb Peter B:
>
> Harry, thanks for your hints.
> But how to do that if I don't want to change the profile of "car" but want 
> to have a separate profile for "truck"  with the appropriate changes ?
> See my questions in
> https://groups.google.com/forum/#!topic/osmand/3YdLYzCkXJM
> Regards Peter
>
> Am Montag, 29. Januar 2018 13:42:47 UTC+1 schrieb Harry van der Wolf:
>>
>> MapFactor Navigator only allows for correct truck driving if you buy the 
>> Tomtom maps. You can indeed set vehicle height, width and weight, but it is 
>> not used unless you have the Tomtom maps.
>>
>> OsmAnd uses internally a routing.xml. It also contains road speeds and 
>> max speed.
>>
>> max speed: 
>> https://github.com/osmandapp/OsmAnd-resources/blob/master/routing/routing.xml#L50
>>
>> With regard to speeds per road: 
>> https://github.com/osmandapp/OsmAnd-resources/blob/master/routing/routing.xml#L266
>>
>> Download that file to your computer, edit it and put it in the Osmand 
>> folder "/Android/data/net.osmand(.plus)/files" on your internal memory or 
>> sdcard, wherever you told Osmand to store its data.
>>
>> Really close Osmand and after opening Osmand again, it should use it.
>>
>> Harry
>>
>> 2018-01-28 20:04 GMT+01:00 Poutnik <poutni...@gmail.com>:
>>
>>> AFAIK, Mapsfactor Navigator, also based on OSM,
>>> does allow to set the custom profile, with custom speed for all road 
>>> kinds.
>>> Definitely worth of trying.
>>>
>>> https://play.google.com/store/apps/details?id=com.mapfactor.navigator
>>>
>>> Dne 28/01/2018 v 17:41 We Ka napsal(a):
>>> > [...
>>> >
>>> > From my point of view, there's just one thing that needs to be fixed,
>>> > and that's the travelling duration: you can not drive 161 kilometres
>>> > in 1 hour and 41 minutes with a truck, not even on an empty German
>>> > autobahn in the middle of the night! :)
>>> >
>>> > The app is in desperate need of the possibility to set the travelling
>>> > speeds for each kind of road, and that's true for all modes, not only
>>> > for trucks!
>>>
>>> --
>>> Poutnik ( The Wanderer )
>>>
>>> My Brouter profiles
>>> https://github.com/poutnikl/Brouter-profiles/wiki
>>>
>>> --
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>>>
>>
>>

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