GPS Nav Systems, Google Maps, etc are so 1491!

All GPS-based navigation are stupid. They assume the world is flat and that you, the traveler, are nothing more than another 2 dimensional object traveling across this flat plane. What is the problem? More and more trucks and freight haulers depend on GPS-based nav systems to get from location A to unfamiliar location B quickly. However, an area like my home town which is dotted with low clearance railroad overpasses presents truckers with an obstacle that they do not know about until it's too late. In many cases, they have to stop (which jams traffic) and attempt to turn around or back up which causes even more traffic issues.

My solution is twofold: 1) GPS-based nav systems and Google Maps should allow you to enter a vehicle / payload height setting. For most trucks 14 feet would be the height. 2) All of the public domain, civil engineering data for bridge and overpass heights should be included as a layer on the maps.

THEN, you as a traveler could specify your vehicle's height and the nav systems would be smart enough to route you AROUND the low clearance obstacles. Not only would that make shipping more efficient, it would also reduce the number of traffic jams and pissed off drivers.

I give this idea freely to the 'ether' in hopes that someone implements it and makes my life easier. But just remember, I thought of it. :-)