noun
priority seating
Seats on public transport designated for elderly, disabled, pregnant, or other passengers needing them.
See also: 優先席
電車の優先座席は、お年寄りや体の不自由な方のための席です。
Priority seats on trains are for elderly and disabled passengers.
Synonym with the same meaning; 優先座席 explicitly includes the character for 'seat' (座席), while 優先席 is slightly shorter and also common.
Compound of 優先 (priority) and 座席 (seat).