Is it safe to live in a neighborhood with only one entrance/exit?

Is there no law that would limit the number of homes that can be built in a subdivision with only one entrance/exit? I just received an email from UClub Realty where they are building an 11th filing thus even adding more homes to an already overly saturated neighborhood. I would think that there would be some law or development “code” that would require so many entrances/exits per “X” number of homes (or residents). Right now, there is only one exit so can you imagine what would happen if UClub had to evacuate in a hurry? What if there was a river breach…or one of the chemical plants right down the road had a major accident…or maybe another 1000 year flood? The chaos of having all of those people trying to exit out of just one exit onto a major highway would not only be dangerous, but it also shows a poor lack of judgment on the developer and whoever governs residential developments. I can see the safety benefit of only one entrance (cameras and security guards needed at just one entrance) but I am truly surprised that there is not a law or code already in place to protect those that live there if an emergency evacuation is ever needed.