In the U. S. highway numbering system, north-south routes have numbers that end in .

1

Explanation:

In simple words, The U.S. stretch of interstate numerical system is an essay about the road set called paths or major roads. These counted main roads are often referred to as national government highways, and thus are synchronized by officials of the American Association of State Highways and Transportation (AASHTO).

Various numbers are being used to show the roads or highways from east to west, and from north to south. The East-West stops in even numbers and the North-South ends in unusual numbers i.e. "1" and "5."

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