In general, passerbys start taking photos and videos. Crane are situated in construction sites (I only go during the night or during the weekends), so if we crash, we'll only kill some ants.

As for the bridges and viaducts, there's either a river underneath (some fish may be harmed), or a plain forest.

So no, no passerby is "put at risk". The risk is very low. It seems dangerous swinging from a crane, but the gear is meant for that. Driving to work is way more dangerous.