Major Interstate routes are designated by one- or two-digit numbers. Routes with odd numbers run north and south, while even numbered run east and west. For north-south routes, the lowest numbers begin in the west, while the lowest numbered east-west routes are in the south. By this method, I-5 runs north-south along the west coast, while I-10 lies east-west along the southern border. The longest east-west interstate is 3,020.54 miles: I‑90 from Boston, Massachusetts, to Seattle, Washington. To qualify for this cache you must have found a total of seven caches, one in each of the states where one of the following major interstates listed passes though. The east/west interstates are 10, 20, 30, 40, 70, 80 and 90. For example to claim a find along Interstate 10, you must have found a cache in either Florida, Alabama, Louisiana, Texas, New Mexico, Arizona or California. You cannot use the same state for two different highways. Only Interstate Highways that end in 0 will be used. The D/T rating on this cache is based on the time, distance and effort needed to find the caches to qualify for the challenge. I40 is visible from the cache.
To get credit for this cache, please include in your log the cache, state and interstate, post a screenshot or bookmark list.
Here's an example of how you would qualify for this cache. Caches do not have to be on the interstate, just in a state each interstate runs through.
10 - Florida - GCXXXXX
20 - South Carolina - GCXXXXX
30 - Arkansas - GCXXXXX
40 - Arizona - GCXXXXX
70 - Kansas - GCXXXXX
80 - Nevada - GCXXXXX
90 - Massacusetts - GCXXXXX