Az, a brief guide to US highway system:
Odd numbers run north-south, even numbers east-west.
Limited-access highways are known as Interstates (I-80, I-15, etc) and have the neat red and blue shield sign. Major roads all end with 5's or 0's. I-5 runs up the west coast, I-95 on the east. I-10 along the south, I-90 up north. 3-digit numbers are for loops and spurs. Hawaii's interstates are numbered H1, H2, etc.
The older system of US routes, such as US 1, US 20, etc, are also federally funded but are normal roads, and have traffic lights and level crossings, though they may also have overpasses. US 1 runs up the east coast and US 101 up the west, otherwise numbering system is similar.
Then there are state highways and county highways. Some cities use numbers for their streets as well. Is this an uniquely American thing?
Odd numbers run north-south, even numbers east-west.
Limited-access highways are known as Interstates (I-80, I-15, etc) and have the neat red and blue shield sign. Major roads all end with 5's or 0's. I-5 runs up the west coast, I-95 on the east. I-10 along the south, I-90 up north. 3-digit numbers are for loops and spurs. Hawaii's interstates are numbered H1, H2, etc.
The older system of US routes, such as US 1, US 20, etc, are also federally funded but are normal roads, and have traffic lights and level crossings, though they may also have overpasses. US 1 runs up the east coast and US 101 up the west, otherwise numbering system is similar.
Then there are state highways and county highways. Some cities use numbers for their streets as well. Is this an uniquely American thing?
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