quadraginta
Becoming Beth
To be honest, I was rather surprised when so many posters said that they routinely wander around construction sites. Where I live, every construction site I've seen is fenced and locked, so that random passers-by without hard hats and safety boots can't enter the site and wander unchecked. If I did enter through an unlocked gate I'd be spotted and immediately ejected by the construction workers.
In heavy commercial construction, especially in densely populated urban conditions this is probably not unusual, but certainly not ubiquitous.
In single family residential it is quite common for there not to be any security fencing.
Thinking about it, I drove by two multi-home/apartment developments while out shopping the other day, and neither of them had security fencing. These were several acres or more with at least a dozen or so homes and condos.
I was on a project on Duke University campus not long before I retired from construction. About twelve years ago, so not in the misty depths of the past. It was a $60 million lab and classroom complex. Not only was there no security fence, we even had groups of people using the access road between our office trailers and the construction area as a shortcut to get from parking lots scattered around campus to the football games. We could tell when the Duke team was underperforming by how many started wandering back through before the game was over.