條扶手梯明明可以左右企兩個人, 係都要則埋右手邊, 受力唔平均, 條梯咪易壞囉。企單邊, 減低載客量, 條梯又易壞, 有冇常識架。

In certain high-traffic systems, including the East Japan Railway Company and the Prague metro, elevator users are encouraged to stand on whichever side they choose, with the aim of preventing wear and tear and asymmetrical burdening.[55]
https://en.wikipedia.org/wiki/Escalator#Etiquette


站穩，切勿走動


http://www.railways.emsd.gov.hk/tc/safety2.html