Daughters of Promise January/February 2016 | Page 9
QUICK FACTS
• Richard Oliver’s red, white, and blue
shield entry in the national competition
for the interstate number sign design was
picked out of a hundred others.
• There are three interstates in Hawaii.
• There’s an average of 3 million ton of
concrete in one mile of the interstate.
• I-90 is the longest, running from
Washington to Massachusetts.
• Length of the highway is 47,856 miles (2013).
• Approximate cost of the interstate under Act 1956
was $128.9 billion; original estimate was $27 billion.
•Routes with odd numbers run North to South.
• Routes with even numbers run East to West.
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