I realized how amazing and well organized the interstate highway system was of the US when I was telling about it to N last month. The amount of science/mathematics involved in it is fantastic! To think up, plan out, implement such a big project and maintain it... totally brilliant!
While posting the photos of the bay bridge, which happens to be I-80, I realized this information is totally worth sharing with everyone who might not be aware of it. As many of you'd probably know and some might not, the highway structure in the US quite systematic and very well planned according to rules. Of course, like every other rule, these rules have exceptions too, but that's not important for now.
The major highways (aka the interstate highways) span the entire country and create a grid. The highways that run North-South are odd numbered and the highways running East-West are even numbered. So if you're traveling on highway I-80 (I is for interstate) you are either going East or West only, never North or South (direction wise only, not Geographically). Similarly, on I-5 which touches the borders of Mexico and Canada, you would be traveling either North or South only.
The odd numbered highways increase in number as you go from West to East and similarly the even numbered highways increase in numbers as you go from South to North. And of course they don't go any higher than two digits. Why? Because according to the system, the three digit numbers are used for other kinds of roads called auxiliary interstate highways which mainly serve the large cities. e.g. I-5 goes through the city of Los Angeles and I-405 connects to I-5 at two locations making a loop. These freeways also follow additional rules.
I am very impressed with this concept, this infrastructure, and love the way they have maps of almost every single area in this country available for general public. All of this just makes me hope and wish that this kind of structure (which I already know has been in making since quite some time now, but still there's a long way to go) and easily available information are soon part of Indian highway system too.
Just one of the reasons why this country is more advanced compared to any other country in the world.