For a Vehicle Emissions Study in the Caldecott Tunnel in Berkeley, CA, Elwood had to travel on a Caltrans tow truck!  After this, the instrument was lowered into the building with a crane.
 
 

These pictures show Elwood sampling particles from one of the tunnel bores. It is obvious from the attire worn by the operators that it was rather cold in the fan room, where we were stationed. In the left picture you can see the fresh-air fans on the left and the exhaust fans on the right.
 
 
 
 
 
 
 
 

In addition to sampling particles from two bores of the tunnel, we also sampled ambient air as a background check.
 
 
 
 
 
 
 

At the end of the study, Elwood was lifted out of the fan room with the crane. Then the instrument was loaded into the moving-truck with the help of the Caltrans tow truck for its journey back home.