A Pangrammatic Highway

http://en.wikipedia.org/wiki/File:I-287_Wanaque_NJ.jpg
Image: Wikipedia

A 0.8-mile stretch of northbound Interstate 287 in New Jersey contains these signs:

WASHINGTON’S HEADQUARTERS
NO TRUCKS IN LEFT LANE
LAFAYETTE AVE.
EXIT 20 MPH
BRIDGE FREEZES BEFORE ROAD SURFACE
INTERSTATE NEW JERSEY 287

To date this is the shortest reported stretch of U.S. highway whose permanent, official signs contain all 26 letters of the alphabet. Do you know a shorter one?

| Language