The traffic report on the radio after the 10:00 news this morning said there were way more than 4 trucks
they said estimates were as high as 11 trucks.
Police officials in Maryland and Virginia reported there were no major incidents related to 30 trucks protesting on busy roadways in the rain.
Source: http://www.myfoxal.com/story/23668961/protesting-truckers-begin-slowing-traffic-in-dc
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so far, not a huge turn out of truck drivers to DC.
pictures
http://www.fireandreamitchell.com/2013/10/11/truckers-constitution-clogging-dc-pictures/
Trucker Ride To DC All Day Live Updates (Photos & Video)