Adding data to road measures

You could use a Sorter and an AttributeManager transformer. When you sort the features first by segment and values, you can use the option of looking at 'Adjacent Features' to see whether VST from the next feature matches the BST value from the current feature. You can use feature[+1].VST to check or set the value from the next (or [-1] for the previous) feature.

A geometric solution. Create a line from (0, 0) to (LEN, 0), generate measure on it, split it by the given measures, then extract measures of start and end nodes for each segment.

select x.VNK, x.NNK, x.M as VST, y.M as BST, x.LEN
from Measure as x inner join Measure as y
on y.VNK = x.VNK and y.NNK = x.NNK and y.count - 1 = x.count   

[
    let $values := fn:distinct-values(
        for $m in (0, fme:process-features("SUB"), fme:get-attribute("LEN"))
        let $v := xs:double($m)
        order by $v ascending
        return $v
    )
    for $i in (1 to fn:count($values) - 1)
    return { "VST" : $values[$i], "BST" : $values[$i + 1] }
]
 

fme:get-attribute("VST"),fme:get-attribute("BST")

Hi there, many thanks to @takashi and all the others!

I have an addendum to the above question:

The resulting table will look like this:

Is there a way to "compress" it, like this? All values with adjacend VST/BST on the same road segment (VNK/NNK) should be combinded: