Interstate Numbering System and How to Decode it

 

 

The Interstate Numbering System is designed to be easy to understand and navigate. Each route is assigned a number, which indicates the type of highway, the direction of the route, and the location within the United States. The Interstate Numbering System consists of three main categories: even numbers (such as I-10), odd numbers (such as I-5), and three-digit routes (such as I-95).

 

The first two digits of the Interstate Numbering System indicate the type of route. Even numbered routes are generally east-west routes, while odd numbered routes are typically north-south routes. The last two digits indicate the location of the route within the United States. For instance, I-95 runs along the east coast from Maine to Florida, while I-75 runs from Michigan to Florida.

 

The three-digit routes are unique because they are not part of the main Interstate Numbering System. Instead, these are auxiliary routes that supplement the main highway system. They are identified by a prefix that indicates the region or state where the route is located. For example, I-495 is an auxiliary route in the Washington, DC area.

 

Once you know the basics of the Interstate Numbering System, it is easy to decode the routes. For example, I-10 is an east-west route that runs from California to Florida. I-5 runs north-south from Washington to California. I-95 runs along the east coast from Maine to Florida. I-75 runs from Michigan to Florida. And I-495 is an auxiliary route in the Washington, DC area.

 

The Interstate Numbering System is an important part of the highway system in the United States. It provides a consistent way to number highways, making it easier to navigate the country. Understanding how to decode the routes is the first step in becoming familiar with the system.