Hi Gerd,
If I comment the roundabout block in the lines file
See my first mail, I have tested roundabouts. Commenting the roundabout block clears problem, but if you instead change objects 0x0c into some other road, then problem remains. More precisely, I think route is correct, when roundabout get the same object as main road, but if roundabout is a different object (not necessary 0x0C), then calculation is wrong. Maybe reason is a turn angle? In my test detours contain roundabouts too. And if I set avoidance to roundabouts in BaseCamp, then detour changes, which suggest that roundabouts aren't the main reason of detour. I think mkgmap processes tag "junction=roundabout", even if there is no roundabout object 0x0C. After commenting the roundabout block, avoidance in BaseCamp still works. But avoidance doesn't work with following line in style: junction=roundabout & highway=* {delete junction} Side note: there is no verification of "class=" value. If I set "class=6" then mkgmap crashes with array index out of bounds exception. -- Best regards, Andrzej