The TSA is attempting to live up to it's name, the Transportation Security Administration, by monitoring our highway system too:

This notice announces that the Transportation Security 
Administration (TSA) has forwarded the new Information Collection 
Request (ICR) abstracted below to the Office of Management and Budget 
(OMB) for review and approval under the Paperwork Reduction Act (PRA). 
The ICR describes the nature of the information collection and its 
expected burden. TSA published a Federal Register notice, with a 60-day 
comment period soliciting comments, of the following collection of 
information on May 29, 2012 77 FR 31632. TSA received four comments in 
response to this notice. Two comments were unrelated to the ICR. The 
remaining two comments were requests for program information. This 
voluntary information collection allows TSA to conduct transportation 
security-related assessments during site visits with security and 
operating officials of surface transportation entities.