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'''Auxiliary Interstate Highways''' (also called '''three-digit Interstate Highways''') are a subset of highways within the United States' [[Interstate Highway System]]. The 323 auxiliary routes generally fall into three types: [[spur route]]s, which connect to or intersect the parent route at one end; [[Bypass (road)|bypasses]], which connect to the parent route at both ends; and [[Ring road|beltways]], which form a circle that intersects the parent route at two locations. Some routes connect to the parent route at one end but to another route at the other end; some states treat these as spurs while others treat them as bypasses. Like the [[List of Interstate Highways|primary Interstate Highways]], auxiliary highways meet [[Interstate Highway standards]] (with rare [[List of gaps in Interstate Highways|exceptions]]).
The shorter auxiliary routes branch from primary routes; their numbers are based on the parent route's number. All of the supplement routes for [[Interstate 95]] (I-95) are designated with a three-digit number ending in "95": I-x95. With some exceptions, spur routes are numbered with an odd hundreds digit (such as [[Interstate 395 (Maine)|I-395]]), while bypasses and beltways are numbered with an even hundreds digit (such as [[Interstate 695 (Maryland)|I-695]]). Because longer Interstates may have many such supplemental routes, the numbers can repeat from state to state along their route, but they will not repeat within a state.
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