${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}{?}_{{?}_{?}},\text{a}\text{t}\text{y}\text{p}\text{e}of\text{t}\text{r}\text{a}\text{n}\text{s}\text{i}\text{t}advertising,\text{a}\text{r}\text{e}\text{m}\text{o}\text{s}\text{t}\text{w}\text{i}\text{d}\text{e}\text{l}\text{y}\text{u}\text{s}\text{e}\text{d}on\text{t}\text{h}\text{e}\text{s}\text{i}\text{d}\text{e}\text{,}\text{r}\text{e}\text{a}\text{r}\text{,}\text{a}\text{n}\text{d}\text{f}\text{r}\text{o}\text{n}\text{t}of\text{a}\text{b}\text{u}\text{s}\text{.}}$

Terminal posters

Outside posters

Inside cards

Car$-$end posters

Bus exteriors