It is not a question. It is very possible that this is not in the federal law. I live in St. Petersburg, accordingly, I collect in Google "RULES of use of land passenger transport (bus, tram, trolleybus) in St. Petersburg" and read paragraph 10:
* by 10. The front 12 seats in the cabin of the tram, 8 seats in the cabin of the trolleybus, 6 seats in the cabin of the bus on the left side along the course of the bus is intended for disabled persons, passengers with children, pregnant women and the elderly.
Other passengers occupying these seats shall release them for those persons.* is
Pay attention to the word "MUST" and look for the rules for your city yourself. For Moscow GUP "Mosgortrans" "Rules of use of the NPP" in paragraph 6.2.7 uses the word "Obligated".
I very much hope that "Prufet" has satisfied you, you are like a part of me too...
Always is yours. The Society.
and----

Give me a fuck and a joke. I bought a ticket and I owe nothing to anyone. Yes, and on the fence also "hui" is written, and what? The fence is fucking?
and----

No, fuck it is you, sadly.