A traffic sensor and a method of operating the traffic sensor to collect vehicular traffic data for a road is described. The user authentication method using the password is very useful for reinforcing the security by applying a simple processing, not necessarily consuming high costs and much time. The controller may, for example, prevent unnecessary wheel slip, allow a traction profile to match a desired profile, and may be used to assist in turning of the vehicle. The message wheels are engaged with the operating shaft, so that they rotate in unison and display like messages through the windows in the covers of their respective units. The TSV interconnect is formed through the semiconductor substrate, overlapping with the contact array and the isolation structure. The microparticles are useful for enhancing CTL responses to a selected antigen.