When traveling by car it is always a big question how to determine the quality of roadside cafe in front of you.
In Russia I've noticed some dependency between quality of food and wares, although prices may be the same. Glass-ware cafe's usually have more quality food than plastic-ware cafe's. Also in Russia there is one good sign that there is good cafe in front of you - lots of lorries. Truckers usually eat at cafes with good food.
Is it generally true in Greece or Turkey?