Every jurisdiction has its own laws, but I am willing to guess that there won't be a statute in Massachusetts controlling as to the number of entrances/exits for a construction site - and certainly not one that would be relevant to your situation. The bottom line is that you collided with a presumably large enough object which was "open and obvious" and which you should have seen, if paying the appropriate attention - or so the defendant contractor will argue. It is often said in the common law that a driver has an obligation to see what should have been seen. I would suggest that if you have comprehensive coverage for your vehicle, file a claim with your own insurance carrier.
Another consideration will be what you were doing at the construction site: if you were not permitted to be there, and if it was posted for trespassing, you could have been entirely at fault for your unauthorized acts.
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