Final answer:
The question appears to be about seating on buses during the segregation era but also alludes to current safety standards. Typically no seats that are not securely fastened to the bus are allowed to ensure passenger safety.
Step-by-step explanation:
The question seems to reference the rules and regulations surrounding seating on public buses, specifically during the period of segregation in the United States. During this time, seating on buses was subject to racial segregation laws, which, among other things, required African Americans to give up their seat if a white passenger had nowhere to sit.
However, in terms of current bus safety standards and regulations, seats must be securely fastened to the bus to ensure passenger safety. Therefore, typically, no seats that are not securely fastened to the bus are allowed. This is to prevent injury to passengers due to unsecured seats in the event of sudden stops, collisions, or accidents.