The article is actually about underpasses, which are not "tunnels" but rather a bridge (or overpass) built on the "other" road.
Such "tunnels" are normally very short and straight, so I cannot understand the reference to turns in the article, a "real" tunnel is several tens of meters, more often hundreds or thousands meters long and very likely is not straight, though I doubt that they are the preferred hideout for mugglers aiming at cyclists.
Such "tunnels" are normally very short and straight, so I cannot understand the reference to turns in the article, a "real" tunnel is several tens of meters, more often hundreds or thousands meters long and very likely is not straight, though I doubt that they are the preferred hideout for mugglers aiming at cyclists.