close emergency signs the tunnel entrance portugal road construction concept safety engineering warning signals |
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| navigate by keyword : asphalt auto bridge car caution city curve direction drive driving entrance freeway geology green high highway hole infrastructure journey landscape lane motion motorway mountain nature outdoors peak range road roadside roadway scenic sky speed speedway street traffic transport transportation travel trip tube tunnel urban valley view voyage way winding |
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| Close-up of emergency signs at the tunnel entrance in Portugal. road construction concept. safety engineering, warning signals, collapse. |
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