On the A68 between Newcastle and Edinburgh (at the car park on top of the hill) there is a section of road where the AI vehicles switch to the right hand side before switching back to the left.
Tested on a profile with Promods only loaded and problem still exists.
Co-ords: ; [19/01/2017 21:10] (sec-0011-0011);-40933.3;154.281;-43424.3;-2.26353;-0.0748871
Screenshots below, one showing the section of road (has no centre line markings) and one showing two trucks leaving the broken section.