Roman crucifixion sites were set up on prominent locations along the main roads and entrances to the cities. Crucifixion was a form of propaganda, to show people how powerful Rome was and what would happen to those who did not submit. 

As horrific as it may seem to us, as they travelled here and there and went about their daily business, the people of that time would have been very used to walking beside dying men hanging on crosses.

Those who passed by hurled insults at him, shaking their heads and saying, “So! You who are going to destroy the temple and build it in three days, come down from the cross and save yourself!” – Mark 15:29-30