Comment Re:From the No Duh Dept. (Score 1) 801
Highways in the US are banked as well, it's called superelevation. Depending on what state you're in, due to winter weather, the rate varies from 6% to 10% max cross slope.
The biggest difference between the US Interstates and the rest of the world is that the US system is a network of tangents and curves. Nearly everyone else (even railroads in the US) uses clothoid spiral curves to transition between the tangents and curves. The spiral gradually changes direction which allows for a more fluid movement, and a faster allowable speed.
The biggest difference between the US Interstates and the rest of the world is that the US system is a network of tangents and curves. Nearly everyone else (even railroads in the US) uses clothoid spiral curves to transition between the tangents and curves. The spiral gradually changes direction which allows for a more fluid movement, and a faster allowable speed.
