colours are those of lower tiers and L is tier 2 (which is arguably too broad, and needs a second colour like cyan for 3 and lightsalmon for 4) as not metro.
ignoring that local names are used elsewhere
hrvm;HRV;Croatia Main Corridors;TMPurple;1;preview
hrvr;HRV;Croatia Regional Tracks;TMGreen;2;preview
hrvl;HRV;Croatia Local Tracks;TMGreen;2;preview