government plans to use satellites to track trucks has been
delayed because signals can be blocked or jammed, according
to a report released last week. Planes, trains and ships also
would be tracked under the plan.
by the Transportation and Defense departments said the problem
with tracking cargo through a Global Positioning System is the
satellite signals could be blocked or jammed by buildings or
interference from other transmissions. Because of the delay,
the plan will be pushed back to 2010, rather than 2008.