Well for Turkey, for road-side cafes and lorries, if there are many lorries, the that cafe is a cheap place where customers probably prefer white beans and rice (a popular duo for truckers). Below is a picture what I mean with white beans and rice
I prefer you not to choose such places.
Beyond that, you probably will find have three type of restaurants:
- Fast food restaurants: You can find food like sandwiches and doner-kebab. Too cheap restaurants are not good, Since such thing are prepared in open kitchens, you can examine the meat and the other ingredients (salads etc...) before you can decide.
- Table d'hote Restaurants: Tabldot in Turkish, these restaurants offers a few options for soups, main course and desert. They are a bit more expensive than fast food restaurants. Since all the food options are behind a glass covered desk, you can examine the food before you choose. You may even ask to taste it before you choose, since owner of the most such restaurants are polite people, that will not cause any problem. But after you taste something, it is not a good idea to change your mind on eating there, since that might be seem a bit unpolite.
- Normal Restaurants: These are normal restaurants you can find in every country, Have close kitchens and it is unlikely to get an idea about food quality and taste before you order something.