I have been working for a GC in a Southeast metro city who learned the hard way.
My guys got robbed at gunpoint and I said we would not be back without protection. The next day the Sup was walking around with a Mae West special in his pocket, and it wasn't because he was glad to see us.
On another job the temporary toilet was continuously being vandalized and rendered useless as we were continuously admonished to be mindful of public safety concerns because the GC was worried about wandering drunks at night.
Well, guess what, the GC finally realized their liability with regards to protecting the public from their activities and installed temporary fencing on both jobs, and then a third jobsite we were through with. Both the type on moveable supports and those with posts, like this one, pounded into the ground.
The way to go is to rent the fence. You should do a great deal of planning because access to the work is critical for your contractors. The planning for sectional or post-driven temporary fencing is just as important as the rest of your pre-construction access and safety planning.
Rent it, and consult your local fencing contractors for advice and costs.