Probably!
Round here contractors seem to sprinkle kit around like confetti.  I reckon when something's been abandoned for a month they aren't coming back for it, but other people are a lot faster.  We got some of those orange safety barriers which had been left for over three months.  Even when you drive past every day it takes a while to get round to hooking up a trailer.
Now I think about it there's a diversion sign just round the corner that was put up before Xmas.  But what do I need it for?  Traffic cones I do need though.