Strange Routing

An example:

Belgrad (44.818306, 20.456250) to Thessaloniki (40.641167, 22.935167):

routing mode: fastest; vehicle type: default car + "small local road" enabled --> 819 km, 08:10:36 h

routing mode: fastest; vehicle type: default car ("small local road" not enabled) --> 636 km, 05:52:24 h