Fix what? All changes were made according to recorded video I've made month ago. Please check first, then complain.

Orange is 50. Red is 70

OK. Here is the map of that street: http://imgur.com/a/LCyoy

Which segment should have 70km/h limit?

Hi Macej. Thank you for question. For some pieces it is set to 50. I went by this road and recorded video. Speed is set correctly, unless something was changed sine last month.

Уверен, что тут 110?

Зачем переименовали "Краков" в "польша"?

Если это все-таки магазин сети АТБ, имхо лучше убрать приставку "супермаркет" для однообразия с остальными такими нодами.

way/386575535 обозначен как shop=second_hand и name=супермаркет АТБ. Я посмотрел на сайте АТБ. У них нет в этом месте магазина. Если это какой-то другой АТБ, почему он обозначен как second_hand а в имени как "супермаркет"?

Вы используете highway=trunk в местах разворотов. Правильно использовать trunk_link. Где нашел - поправил.

I guess trunk_link should be used as link between two lines

Hi. I've removed your Post Office node as it duplicates same node node/2939806443

There is C-12 sign before Rondo. So it is runabout.

I mean number of this one:
way/371474131

Building number is lost

opening%20hours=*?uselang=en-GB

There is special value designed for public holidays "PH". You do not need to specify all holidays. See

PH Public Holiday, can be used to indicate different opening hours during public holidays (e.g., Mo-Fr 09:00-17:00; PH 10:00-12:00; PH Su off)

Я про node/3757454908

Согласно [url=http://wiki.openstreetmap.org/wiki/Tag:amenity=car%20wash?uselang=en-GB]этой статье[/url], надо пользовать amenity=car_wash

But as I can see this approach does not work in Poland.

Your data is not lost. I did not destroy result of your work. I just moved data to one place, to relation.