Understanding U.S. Interstate Highway Numbers
Navigating U.S. interstate highways can be confusing, but there's a simple logic to the numbering system that can help.
Interstate Numbering Basics
East-West Interstates: Even numbers, increasing from I-10 (south) to I-90(north).
North-South Interstates: Odd numbers, increasing from I-5 (west) to I-95 (east)
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Interstate Exit Numbers
-States typically use one of two methods for numbering Interstate interchange exits:
The Consecutive Numbering System: Starting at the most westerly or southerly point on each Interstate route, interchanges are numbered consecutively. Thus, the first interchange becomes Interchange #1. Each succeeding interchange is numbered consecutively as #2, #3, #4, etc.
The Milepost Numbering System: All Interstate routes are mileposted beginning at the most westerly or southerly point. The starting point is milepost '0'. If the first interchange on the route is located between milepost 4.0 and 5.0, it is numbered as Interchange #4. The next interchange, if located at milepost 8.7, would be numbered as Interchange #8, etc. With this system, the motorist can easily determine the location and distance to a desired interchange.
Remember this simple system to make your road trips more intuitive and enjoyable.
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4 个月Easy understanding and informative.
Student intern at City of New Haven, (Transportation, Traffic & Parking). Social Media Manager, SEI Student Chapter, University of New Haven.
4 个月Very informative