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					Originally Posted by  Mobhack
					 
				 
				Tunnels would be completely Impossible. Negative elevations are used for water features (that is why mountainside streams plunge into deep caverns). 
 
As for tunnels under water - no, even deeper terrain than a lake, so even more impossible. 
			
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 So, imagine a world where vehicular tunnels are impossible and they're all bridges instead? I can live with that. 
(My grandfather hobo'd to New York City in the 1920's, made some money working there and bought a used car which he then crashed in the Holland Tunnel because he had never before operated anything more complex than a mule. He never went back to New York City.)
Here's a quick preview of a university, some high-income subdivisions and industrial buildings in Union Township, New Jersey, on the southwest corner of my map. It feels a little dense but then it is in one of the most densely-populated parts of America.