This is exactly what i saw on TwoNav. Once tried then I forgot about it.
But still i think ''elevation signs'' can be at least complementary to this colours.
This ''winter'' I made few bicycle trips with my brother Etrex 30, since then i like ,,elevation signs'' very much.
Red colour means we are on the top of the hillon our track or we are just on high altitude in this case more then 2000 meters ?
For ex when you created route ( on normal poved roads) from Insbruck then Solden to Tiefenbachgletscher on about 2800. How it would looks like ?
I know in Locus we can see information about the track , chart ascent, descent etc .
But this little icons we see on the map we don't have to seek, think and click anywhere.
In Garmin they are appeared automatically after you press ,,GO'' along selected track.
( Unfortunatelly tracks can not be created in Etrex they have to be imported for ex from BaseComp or..... Locus what i did.)