She agreed to meet one of them one day under a highway overpass.

她说，后来她同意在公路天桥下见了一位。

youdao

The Railway-Crossing-Highway Overpass Bridge is along with the railway. It has six lanes, double-sided pavements.

公铁立交桥沿铁路方向，双向六车道，双侧人行道。

youdao

Six negligently clothed Native Americans lounge under or, on a grassy and wooded slope, beside a highway overpass.

NEWYORKER: Flashes of Light

For example, on 8 December, the unlikely setting for the Very Involved fun day is a space under a highway overpass in a commercial area of Kwun Tong.

BBC: A very Hong Kong festival

Derailed rail cars then struck columns supporting the Highway M overpass, causing it to buckle and partially collapse.

WSJ: Mo. highway buckles after rail cars hit overpass