A couple of suggestions. Unless your aim is to keep to the coast, the A90 to Frazerburgh is a main artery full of lorries and buses. I would suggest diverting off it at North Water Bridge and heading to Fettercairn and then the Cairn O'Mount B974 and wind your way north via Alford to Fraserburgh. https://www.google.co.uk/maps/dir/Stracathro/Cairn+o'+Mount,+Old+Military+Rd,+Laurencekirk+AB30+1HB/Alford/Fraserburgh/@57.2301695,-3.4888809,8z/data=!3m1!4b1!4m26!4m25!1m5!1m1!1s0x48868451aa206ccd:0x583cc3f90fda534e!2m2!1d-2.617207!2d56.777071!1m5!1m1!1s0x4884280ad96d4d53:0x6614ef880f5c751d!2m2!1d-2.5776565!2d56.9161596!1m5!1m1!1s0x4884336218836669:0xa20781a234ac3d8b!2m2!1d-2.704753!2d57.233323!1m5!1m1!1s0x48837fd867aed7d5:0x726d7387002dae11!2m2!1d-2.007631!2d57.693352!3e0 For the ride south from Glasgow, take the M77 and then the A76 to Dumfries and the A709 to join the motorway at Lockerbie.