I am both a traffic dork and a trivia junky.   I stumbled upon these bits of highway trivia today while surfing the Federal Highway web site.  

(Something about those last two sentances makes me feel I've taken a seriusly wrong turn somewhere in my life.) 

Oh well, maybe I'll start a Transportation Trivia section.

http://www.fhwa.dot.gov/programadmin/interstate.cfm

Interstate	From To	Miles
Longest Interstate Routes:
I-90	Seattle, WA to Boston, MA	3,020.54 miles
I-80	San Francisco, CA to Teaneck, NJ	2,899.54 miles
I-40	Barstow, CA to Wilmington, NC	2,555.40 miles
Shortest (2-Digit) Interstate Routes:
I-97	Annapolis to Baltimore, MD	17.62 miles
I-99	Bedford to Bald Eagle, PA	53.00 miles*
I-73	Emery to Greensboro, NC	56.70 miles

Interstate	States	Number
Interstate Routes Which Traverse the Most States:
I-95	FL,GA,SC,NC,VA,DC,MD,DE,PA,NJ,NY,CT,RI,MA,NH,ME	16 States
I-90	WA,ID,MT,WY,SD,MN,WI,IL,IN,OH,PA,NY,MA	13 States
I-80	CA,NV,UT,WY,NE,IA,IL,IN,OH,PA,NJ	11 States